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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
идиома
Примеры
The manager kept the documents under lock and key.
LanGeek
