let the cat out of the bag
spill the beans
secret
make known
out
pseudosecret
babble
tip one's hand
divulgence
divulgement
hush up
secernent
darkness
divulgation
exposure
disembosom
secrecy
keep quiet
confidence
keep a lid on
give away
keep from
hidness
under the covers
cryptadia
on the down-low
concealment
sensitive
hiding
oversecrete
on the hush
occulted
concealing
silence
secretiveness
stall
secretively
shoot off at the mouth
under wraps
sing like a bird
keep one's lips sealed
out with it
secretive
leak
under the table
hideling
off-the-record
keep to oneself
obreptitious
between you and me
closehanded
subterraneous
closehandedness
leak out
blabber
keep
subterranean
tick a lock
transpire
covert
open secret
ulterior
underhanded
let in on
give the game away
mum's the word
entrust
hypersecretion
semisecret
yield up
clandestinely
secret of Polichinelle
conceal
cloakedly
secretly
stealth
betray
confidentiality
mum
crypto-
backroom
under one's hat
disguise
hypersecretory
dark
one's lips are sealed
semisecrecy
secretionary
something nasty in the woodshed
abscond
underwrapped
uncover
hypersecrete
secretional