sing in WordNet English dictionary

1. divulge confidential information or secrets
   "Be careful--his secretary talks"
   spill the beans  let the cat out of the bag  talk  tattle  blab  peach  babble  sing  babble out  blab out 
   
2. make a whining, ringing, or whistling sound
   "the kettle was singing"; "the bullet sang past his ear"
   whistle  sing 
   
3. to make melodious sounds
   "The nightingale was singing"
   sing 
   
4. produce tones with the voice
   "She was singing while she was cooking"; "My brother sings very well"
   sing 
   
5. deliver by singing
   "Sing Christmas carols"
   sing