on the loose
idiom
                                
              
          
                                                      : able to move freely : not controlled or held in a prison, cage, etc.                                      
                
                  —used especially to describe a dangerous person, animal, or group
The prisoner escaped and is still on the loose.
A killer is on the loose.
An angry mob was on the loose.
    
                
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  Merriam-Webster unabridged




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