From WordNet (r) 3.0 (2006):
sing
v 1: deliver by singing; "Sing Christmas carols"
2: produce tones with the voice; "She was singing while she was
cooking"; "My brother sings very well"
3: to make melodious sounds; "The nightingale was singing"
4: make a whining, ringing, or whistling sound; "the kettle was
singing"; "the bullet sang past his ear" [syn: whistle,
sing]
5: divulge confidential information or secrets; "Be careful--his
secretary talks" [syn: spill the beans, let the cat out of
the bag, talk, tattle, blab, peach, babble,
sing, babble out, blab out] [ant: keep one's mouth
shut, keep quiet, shut one's mouth]