be/go on the prowl(redirected from be on the prowl)
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be/go on the ˈprowl
1 (of animals) move around quietly while hunting for food: Our cats go on the prowl at night, and then they sleep here all day.
2 (of people) be moving around quietly because you are trying to catch somebody or intending to commit a crime: Look out for burglars on the prowl. If you see anything suspicious, call the police immediately.