Tra từ under lock and key - Từ điển Oxford Advanced Learner 8th

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Từ điển Oxford Advanced Learner 8th

keep something something under lock and key (keep sth/put sth/be) under ˌlock and ˈkey idiom locked up safely somewhere; in prison •We keep our valuables under lock and key. •I will not rest until the murderer is under lock and key. Main entry: ↑lock_idiom