skinny
know where the bodies are buried
inside information
details
get wind of
spill the beans
babble out
blab
sing
talk
peach
tattle
babble
let the cat out of the bag
blab out
blag
tip
confidentialised
shut one's mouth
keep one's mouth shut
keep quiet
talebearing
get a line on
spill the tea
tell tales out of school
blabbermouthed
clued up
shoot off at the mouth
confidentially
tattling
leaky
espionage
let in on
leak
divulgence
news leak
open the kimono
divulgement
doc drop
confidentiality
closelipped
tightlipped
close
closemouthed
secretive
under one's hat
professional secrecy
give away
semisecret
confidentialness