- wag (v.)
- early 13c., "waver, vacillate, lack steadfastness," probably from a Scandinavian source (cf. Old Norse vagga "a cradle," Danish vugge "rock a cradle," Old Swedish wagga "fluctuate"), and in part from Old English wagian "move backwards and forwards;" all from Proto-Germanic *wagojanan (cf. Old High German weggen, Gothic wagjan "to wag"), probably from PIE root *wegh- "to move about" (see weigh). Meaning "to move back and forth or up and down" is from c.1300. Wagtail is attested from c.1500 as a kind of small bird (late 12c. as a surname); 18c. as "a harlot," but seems to be implied much earlier:
If therefore thou make not thy mistress a goldfinch, thou mayst chance to find her a wagtaile. [Lyly, "Midas," 1592]
Wag-at-the-wall (1825) was an old name for a hanging clock with pendulum and weights exposed.
- wag (n.)
- "person fond of making jokes," 1550s, perhaps a shortening of waghalter "gallows bird," person destined to swing in a noose or halter, applied humorously to mischievous children, from wag (v.) + halter. Or possibly directly from wag (v.).