keep something under your hat

Значение

to not tell anyone else about something

Никому об этом не рассказывать.

Примеры

1. 1I'm pregnant, but please keep it under your hat until we've told our parents.
2. 2My sister asked me to keep it under my hat that she's moving to Canada.
3. 3The shop is closing next month, but keep it under your hat until the staff meeting.
4. 4Maria kept it under her hat that she'd been offered the job in Paris.
5. 5Can you keep this under your hat? The wedding date isn't official yet.

Грамматика

Меняется только keep: keeps, keeping, kept. something — короткое дополнение: it или this; your меняется по лицу.