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From The Collaborative International Dictionary of English v.0.48:
Wag \Wag\, v. t. [imp. & p. p. Wagged; p. pr. & vb. n. Wagging.] [OE. waggen; probably of Scand. origin; cf. Sw. vagga to rock a cradle, vagga cradle, Icel. vagga, Dan. vugge; akin to AS. wagian to move, wag, wegan to bear, carry, G. & D. bewegen to move, and E. weigh. [root]136. See Weigh.] To move one way and the other with quick turns; to shake to and fro; to move vibratingly; to cause to vibrate, as a part of the body; as, to wag the head. [1913 Webster] No discerner durst wag his tongue in censure. --Shak. [1913 Webster] Every one that passeth thereby shall be astonished, and wag his head. --Jer. xviii. 16. [1913 Webster] Note: Wag expresses specifically the motion of the head and body used in buffoonery, mirth, derision, sport, and mockery. [1913 Webster]