if a person or animal is loose, they can move around easily because they are not tied to anything, not held by anyone, or not kept inside something
A large dog was loose in the garden.
break/shake/get loose (from someone/something) (=become free): The woman managed to break loose from her attacker and run for help.
turn/set/let someone loose (=allow someone to be free): The kidnappers had set him loose on a dark country lane.
Synonyms and related words