ping


From The Collaborative International Dictionary of English v.0.48:

Ping \Ping\, n. [Probably of imitative origin.]
   The sound made by a bullet in striking a solid object or in
   passing through the air.
   [1913 Webster]
.

From The Collaborative International Dictionary of English v.0.48:

Ping \Ping\, v. i. [imp. & p. p. Pinged; p. pr. & vb. n.
   Pinging.]
   To make the sound called ping.
   [1913 Webster]
.

From The Collaborative International Dictionary of English v.0.48:

backfire \backfire\, back fire \back fire\
   1. A fire started ahead of a forest or prairie fire to burn
      only against the wind, so that when the two fires meet
      both must go out for lack of fuel.
      [Webster 1913 Suppl.]

   2.
      (a) A premature explosion in the cylinder of a gas or oil
          engine during the exhaust or the compression stroke,
          tending to drive the piston in a direction reverse to
          that in which it should travel; also called a knock
          or ping.
      (b) an explosion in the exhaust passages of an internal
          combustion engine.
          [Webster 1913 Suppl. +PJC] Backfire
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