From WordNet (r) 3.0 (2006):
refrain
n 1: the part of a song where a soloist is joined by a group of
singers [syn: refrain, chorus]
v 1: resist doing something; "He refrained from hitting him
back"; "she could not forbear weeping" [syn: refrain,
forbear] [ant: act, move]
2: choose not to consume; "I abstain from alcohol" [syn:
abstain, refrain, desist] [ant: consume, have,
ingest, take, take in]