under lock and key
locked away safely:
Her jewellery is securely under lock and key at the bank.
If a person, especially a criminal, is under lock and key, they are being kept in a place from which they cannot escape, usually a prison.
Thesaurus: synonyms and related words
Locking and bolting
- bar
- batten
- bolt
- handcuff
- latch
- lock
- lock (sth) up
- lock sb in
- lock sb out
- lock sth away
- lockable
- love lock
- manacle
- padlock
- shut
- shut sth away
You can also find related words, phrases, and synonyms in the topics:
Putting people in prison