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. √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.
No discerner durst wag his tongue in censure. Shak.
Every one that passeth thereby shall be astonished, and wag his head. Jer. xviii. 16.
☞ Wag expresses specifically the motion of the head and body used in buffoonery, mirth, derision, sport, and mockery.