sing.

动词 sing.:

1. deliver by singing
   同义词：sing
2. produce tones with the voice
   同义词：sing
3. to make melodious sounds
   同义词：sing
4. make a whining, ringing, or whistling sound
   同义词：whistle, sing
5. divulge confidential information or secrets
   同义词：spill the beans, let the cat out of the bag, talk, tattle, blab, peach, babble, sing, babble out, blab out