guard lock

From The Collaborative International Dictionary of English v.0.48:

Guard \Guard\, n. [OF. guarde, F. garde; of German origin; cf.
   OHG. wart, warto, one who watches, warta a watching, Goth.
   wardja watchman. See Guard, v. t.]
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   1. One who, or that which, guards from injury, danger,
      exposure, or attack; defense; protection.
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            His greatness was no guard to bar heaven's shaft.
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   2. A man, or body of men, stationed to protect or control a
      person or position; a watch; a sentinel.
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            The guard which kept the door of the king's house.
                                                  --Kings xiv.
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   3. One who has charge of a mail coach or a railway train; a
      conductor. [Eng.]
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   4. Any fixture or attachment designed to protect or secure
      against injury, soiling, or defacement, theft or loss; as:
      (a) That part of a sword hilt which protects the hand.
      (b) Ornamental lace or hem protecting the edge of a
      (c) A chain or cord for fastening a watch to one's person
          or dress.
      (d) A fence or rail to prevent falling from the deck of a
      (e) An extension of the deck of a vessel beyond the hull;
          esp., in side-wheel steam vessels, the framework of
          strong timbers, which curves out on each side beyond
          the paddle wheel, and protects it and the shaft
          against collision.
      (f) A plate of metal, beneath the stock, or the lock
          frame, of a gun or pistol, having a loop, called a
          bow, to protect the trigger.
      (g) (Bookbinding) An interleaved strip at the back, as in
          a scrap book, to guard against its breaking when
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   5. A posture of defense in fencing, and in bayonet and saber
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   6. An expression or admission intended to secure against
      objections or censure.
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            They have expressed themselves with as few guards
            and restrictions as I.                --Atterbury.
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   7. Watch; heed; care; attention; as, to keep guard.
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   8. (Zool.) The fibrous sheath which covers the phragmacone of
      the Belemnites.
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   Note: Guard is often used adjectively or in combination; as,
         guard boat or guardboat; guardroom or guard room; guard
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   Advanced guard, Coast guard, etc. See under Advanced,
      Coast, etc.

   Grand guard (Mil.), one of the posts of the second line
      belonging to a system of advance posts of an army.

   Guard boat.
      (a) A boat appointed to row the rounds among ships of war
          in a harbor, to see that their officers keep a good
      (b) A boat used by harbor authorities to enforce the
          observance of quarantine regulations.

   Guard cells (Bot.), the bordering cells of stomates; they
      are crescent-shaped and contain chlorophyll.

   Guard chamber, a guardroom.

   Guard detail (Mil.), men from a company regiment etc.,
      detailed for guard duty.

   Guard duty (Mil.), the duty of watching patrolling, etc.,
      performed by a sentinel or sentinels.

   Guard lock (Engin.), a tide lock at the mouth of a dock or

   Guard of honor (Mil.), a guard appointed to receive or to
      accompany eminent persons.

   Guard rail (Railroads), a rail placed on the inside of a
      main rail, on bridges, at switches, etc., as a safeguard
      against derailment.

   Guard ship, a war vessel appointed to superintend the
      marine affairs in a harbor, and also, in the English
      service, to receive seamen till they can be distributed
      among their respective ships.

   Life guard (Mil.), a body of select troops attending the
      person of a prince or high officer.

   Off one's guard, in a careless state; inattentive;
      unsuspicious of danger.

   On guard, serving in the capacity of a guard; doing duty as
      a guard or sentinel; watching.

   On one's guard, in a watchful state; alert; vigilant.

   To mount guard (Mil.), to go on duty as a guard or

   To run the guard, to pass the watch or sentinel without

   Syn: Defense; shield; protection; safeguard; convoy; escort;
        care; attention; watch; heed.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48:

Tide \Tide\, n. [AS. t[imac]d time; akin to OS. & OFries.
   t[imac]d, D. tijd, G. zeit, OHG. z[imac]t, Icel. t[imac]?,
   Sw. & Dan. tid, and probably to Skr. aditi unlimited,
   endless, where a- is a negative prefix. [root]58. Cf.
   Tidings, Tidy, Till, prep., Time.]
   1. Time; period; season. [Obsoles.] "This lusty summer's
      tide." --Chaucer.
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            And rest their weary limbs a tide.    --Spenser.
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            Which, at the appointed tide,
            Each one did make his bride.          --Spenser.
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            At the tide of Christ his birth.      --Fuller.
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   2. The alternate rising and falling of the waters of the
      ocean, and of bays, rivers, etc., connected therewith. The
      tide ebbs and flows twice in each lunar day, or the space
      of a little more than twenty-four hours. It is occasioned
      by the attraction of the sun and moon (the influence of
      the latter being three times that of the former), acting
      unequally on the waters in different parts of the earth,
      thus disturbing their equilibrium. A high tide upon one
      side of the earth is accompanied by a high tide upon the
      opposite side. Hence, when the sun and moon are in
      conjunction or opposition, as at new moon and full moon,
      their action is such as to produce a greater than the
      usual tide, called the spring tide, as represented in
      the cut. When the moon is in the first or third quarter,
      the sun's attraction in part counteracts the effect of the
      moon's attraction, thus producing under the moon a smaller
      tide than usual, called the neap tide.
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   Note: The flow or rising of the water is called flood tide,
         and the reflux, ebb tide.
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   3. A stream; current; flood; as, a tide of blood. "Let in the
      tide of knaves once more; my cook and I'll provide."
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   4. Tendency or direction of causes, influences, or events;
      course; current.
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            There is a tide in the affairs of men,
            Which, taken at the flood, leads on to fortune.
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   5. Violent confluence. [Obs.] --Bacon.
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   6. (Mining) The period of twelve hours.
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   Atmospheric tides, tidal movements of the atmosphere
      similar to those of the ocean, and produced in the same
      manner by the attractive forces of the sun and moon.

   Inferior tide. See under Inferior, a.

   To work double tides. See under Work, v. t.

   Tide day, the interval between the occurrences of two
      consecutive maxima of the resultant wave at the same
      place. Its length varies as the components of sun and moon
      waves approach to, or recede from, one another. A
      retardation from this cause is called the lagging of the
      tide, while the acceleration of the recurrence of high
      water is termed the priming of the tide. See {Lag of the
      tide}, under 2d Lag.

   Tide dial, a dial to exhibit the state of the tides at any

   Tide gate.
      (a) An opening through which water may flow freely when
          the tide sets in one direction, but which closes
          automatically and prevents the water from flowing in
          the other direction.
      (b) (Naut.) A place where the tide runs with great
          velocity, as through a gate.

   Tide gauge, a gauge for showing the height of the tide;
      especially, a contrivance for registering the state of the
      tide continuously at every instant of time. --Brande & C.

   Tide lock, a lock situated between an inclosed basin, or a
      canal, and the tide water of a harbor or river, when they
      are on different levels, so that craft can pass either way
      at all times of the tide; -- called also guard lock.

   Tide mill. (a) A mill operated by the tidal currents.
      (b) A mill for clearing lands from tide water.

   Tide rip, a body of water made rough by the conflict of
      opposing tides or currents.

   Tide table, a table giving the time of the rise and fall of
      the tide at any place.

   Tide water, water affected by the flow of the tide; hence,
      broadly, the seaboard.

   Tide wave, or Tidal wave, the swell of water as the tide
      moves. That of the ocean is called primitive; that of bays
      or channels derivative. See also tidal wave in the
      vocabulary. --Whewell.

   Tide wheel, a water wheel so constructed as to be moved by
      the ebb or flow of the tide.
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