n. & v.
n. 1 a a small hound of a breed with a short coat, used for hunting hares. b this breed. 2 hist. an informer or spy; a constable.
v.intr. (often as beagling n.) hunt with beagles. beagler n.
[ ME f. OF beegueule noisy person, prob. f. beer open wide + gueule throat ]