let the cat out of the bag vs sing

let the cat out of the bag and sing both are verbs.

Word	Noun	Adjective	Verb	Adverb
let the cat out of the bag	No	No	Yes	No
sing	No	No	Yes	No

As verbs, let the cat out of the bag and sing are synonyms defined as:

let the cat out of the bag and sing: divulge confidential information or secrets

Other synonyms of let the cat out of the bag include babble, babble out, blab, blab out, peach, spill the beans, talk, tattle.

let the cat out of the bag (verb)	sing (verb)
divulge confidential information or secrets	make a whining, ringing, or whistling sound
	divulge confidential information or secrets
	to make melodious sounds
	produce tones with the voice
	deliver by singing