keep a lid on
let the cat out of the bag
secret
stall
keep
spill the beans
cryptadia
out
concealment
keep quiet
hush up
babble
make known
keep from
disembosom
under wraps
secrecy
oversecrete
keep one's lips sealed
under the covers
classify
on the down-low
darkness
keep to oneself
concealing
hiding
secernent
off-the-record
dark
underwrapped
on the hush
subterranean
secretiveness
tick a lock
transpire
silence
mum
crypto-
blabber
closehandedness
sensitive
conceal
occulted
closehanded
sing like a bird
confidentiality
tip one's hand
secretive
exposure
give the game away