sing

1 to produce musical sounds with the voice <it's relatively rare to find actors who can also sing well> Synonyms carol, chant, descant, vocalize Related Words belt, croon, harmonize, hum, lilt, quaver, scat, sharp, slur, trill, troll, warble, yodel; serenade

2 to utter in musical or drawn out tones <the cantor sang the prayers before the entire congregation> Synonyms intonate, intone, chantRelated Words bellow, belt, roar; chime, chorus

3 to utter one's distinctive animal sound <I can hear a bird singing in the distance> Synonyms call, cry

4 to give information (as to the authorities) about another's improper or unlawful activities <once he saw the kind of jail time he was facing, the suspect was singing loud and clear to the police> Synonyms fink, grass (on) [British slang], inform, rat (on), squeal, snitch, split (on) [British], squeak, talk, tell (on)Related Words betray, give away, turn in; backstab, cross, double-cross, sell (out), two-time; blab, tattle; tip (off)