blab vs let the cat out of the bag

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

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

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

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

Other synonyms of blab include babble, babble out, blab out, peach, sing, spill the beans, talk, tattle.

blab (verb)	let the cat out of the bag (verb)
divulge confidential information or secrets	divulge confidential information or secrets
speak (about unimportant matters) rapidly and incessantly