under lock and key

phrase

: in a room, box, etc., that is locked

The jewels are kept under lock and key.

The prisoner is being kept/held under lock and key.

Examples of under lock and key in a Sentence

Recent Examples on the Web

Copies were bought in bulk, either destroyed or kept under lock and key. — Brayden Garcia, Fort Worth Star-Telegram, 22 Sep. 2026

So far, Falchuk has filmed seven episodes, four of which are still under lock and key. — Michael Schulman, New Yorker, 5 Sep. 2026

The A-list couple is rumored to be celebrating their matrimony on Friday, July 3, at Madison Square Garden, though most details about the big day remain under lock and key. — Brendan Morrow, USA Today, 3 July 2026

The fact is the Original 13 state keeps some paperwork under lock and key for 100 years to everyone except the participants. — Dominic Patten, Deadline, 2 July 2026

Rhymes for under lock and key

• actuality
• angiography
• laryngoscopy
• predominately
• sensuality
• stochastically
• abc
• absentee
• addressee
• adoptee
• allottee
• amphorae