What does “on the loose” mean?

having escaped from somewhere; free

How is “on the loose” used?

In Batman: The Dark Knight Returns, Part 2 (2013), one line is: “Joker is now reported to be on the loose...”

The clip at the top of this page is from Batman: The Dark Knight Returns, Part 2 (2013).

Joker is now reported to be on the loose...

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