to keep something under lock and key
/kˈiːp ˌɛstˌiːˈeɪtʃ ˌʌndɚ lˈɑːk ænd kˈiː/
to keep something under lock and key
01
to keep something private, hidden, or carefully protected
习语
例子
The manager kept the documents under lock and key.
to keep something private, hidden, or carefully protected
