under lock and key

Language: en

Meaning: (US,UK,idiomatic)Imprisonedwith little or no chance of escape;locked up.If it was him we can have himunder lock and keyin 24 hours.; (US,UK,idiomatic)Safelyguarded;lockedaway.2008, Edward J. McMillan,Model Policies and Procedures for Not-for-Profit Organizations, page239:It is the policy of the organization to keep unused check supplies safeguardedunder lock and key.

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