let the cat out of the bag
talk
tattle
blab
peach
babble
babble out
blab out
unwrap (generic term)
disclose (generic term)
let on (generic term)
bring out (generic term)
reveal (generic term)
discover (generic term)
expose (generic term)
divulge (generic term)
break (generic term)
give away (generic term)
let out (generic term)
uncover (generic term)
keep quiet (antonym)