keep something under hat
keep (something) under (your) hat
to keep something secret.
I've got some interesting news, but you must promise to keep it under your hat for the moment.

[TahlilGaran] English Idioms Dictionary ▲

keep under hat
keep (something) under (your) hat
to keep something secret.
I've got some interesting news, but you must promise to keep it under your hat for the moment.

[TahlilGaran] English Idioms Dictionary ▲

keep something under one's hat
keep a secret, do not tell something
He won't say where he is going for his holiday. He wants to keep it under his hat.

I plan to keep my plans to look for a new job under my hat.

[TahlilGaran] English Idioms Dictionary ▲

keep under one's hat
keep a secret, do not tell something
He won't say where he is going for his holiday. He wants to keep it under his hat.

I plan to keep my plans to look for a new job under my hat.

[TahlilGaran] English Idioms Dictionary ▲

keep under one's hat
v. phr., informal To keep secret; not tell.
Mr. Jones knew who had won the contest, but he kept it under his hat until it was announced publicly.
■ Often used as a command.
Keep it under your hat.
Synonym: KEEP TO ONESELF.

[TahlilGaran] English Idioms Dictionary ▲