Synonyms of keep something under one's hat in English:

keep something under one's hat


See definition of keep something under one's hat

phrase

1‘at the moment it's all a bit hush-hush, so keep it under your hat’

SYNONYMS
conceal, hide, cover up, disguise, dissemble, mask, veil
keep secret, keep quiet about, keep dark, hush up, draw a veil over, sweep under the carpet, gloss over
suppress, repress, bottle up, bury
informal keep a lid on, keep the lid on
ANTONYMS

show, disclose, confess