kiss and tell
Betray a confidence, as in A real lady doesn't kiss and tell. This idiom originally alluded to betraying an amorous or sexual intimacy. First recorded in 1695, it is still so used, as well as more loosely, as in Don't ask how I voted; I don't kiss and tell.
Words nearby kiss and tell
kislev,
kismayu,
kismet,
kiss,
kiss and make up,
kiss and tell,
kiss ass,
kiss curl,
kiss good-bye,
kiss of death,
kiss of life