to keep something under lock and key
Pronunciation
/kˈiːp ˌɛstˌiːˈeɪtʃ ˌʌndɚ lˈɑːk ænd kˈiː/

Définition et signification de « keep something under lock and key » en anglais

to keep something under lock and key
01

to keep something private, hidden, or carefully protected 

idiome
Exemples
The manager kept the documents under lock and key. 
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