Synonyms of 'on the loose'
▷ See loose
freeDictionary, roaming, at large
A man-eating lion is on the loose.
All the hostages are free.
If you say that a dangerous person, thing, or animal is at large, you mean that they have not been captured or made safe.
The man who tried to have her killed is still at large.
on the run
The four men still on the run are Rule 43 prisoners.
There is no confirmation that he is at liberty.
If you describe someone's behaviour as unrestrained, you mean that it is extreme or intense, for example because they are expressing their feelings strongly or loudly.
There was unrestrained joy on the faces of the people.
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Thesaurus for on the loose from the Collins English Thesaurus
If a person or an animal is on the loose , they are free because they have escaped from a person or place.