wag1
v.
(wags, wagging, wagged)
(especially with reference to an animal's tail) move rapidly to and fro.
n.
a wagging movement.
Etymology
ME: from the Gmc base of OE wagian ‘to sway’.
wag2
n.
a person who makes facetious jokes.
v.
(wags, wagging, wagged)
Austral./NZ play truant from (school).
Etymology
C16 (denoting a young man or mischievous boy): prob. from obs. waghalter ‘person likely to be hanged’.