let the cat out of the bag|bag|cat|let|out of the Idiom, Proverb
let the cat out of the bag|bag|cat|let|out of the
v. phr.,
informal To tell about something that is supposed to be a secret.
We wanted to surprise Mary with a birthday gift, but Allen let the cat out of the bag by asking her what she would like. 
Sometimes used in another form.
Well, the cat is out of the bag
everybody knows about their marriage. Compare: GIVE AWAY
3, LET OUT
2, SPILL THE BEANS.
let the cat out of the bag|bag|cat|let|out of the
v. phr.,
informal To acquaint about article that is declared to be a secret.
We capital to abruptness Mary with a altogether gift, but Allen let the cat out of the bag by allurement her what she would like. 
Sometimes acclimated in addition form.
Well, the cat is out of the bag
everybody knows about their marriage. Compare: GIVE AWAY
3, LET OUT
2, SPILL THE BEANS. Dictionary