definition of
sing

[1] #1 sing v. deliver by singing; "Sing Christmas carols". wn

[2] #2 sing v. produce tones with the voice; "She was singing while she was cooking"; "My brother sings very well". wn

[3] #3 sing v. to make melodious sounds; "The nightingale was singing". wn

[4] #4 sing v. [whistle] make a whining, ringing, or whistling sound; "the kettle was singing"; "the bullet sang past his ear". wn

[5] #5 sing v. [spill the beans, let the cat out of the bag, talk, tattle, blab, peach, babble, babble out, blab out] divulge confidential information or secrets; "Be careful--his secretary talks". wn