n. & v. sl.
n. Brit. 1 a fund-raising programme of stunts, parades, and entertainment organized by students. 2 colloq. a prank. 3 a a rowdy celebration. b a noisy disorderly scene.
v. (ragged, ragging) 1 tr. tease; torment; play rough jokes on. 2 tr. scold; reprove severely. 3 intr. Brit. engage in rough play; be noisy and riotous.
[ 18th c.: orig. unkn.: cf. BALLYRAG ]