late 14c., prollen, "move about in search of something," of unknown origin, with no known cognates. Spelling with -w- is from 1500s (compare bowls), but pronounced "prôll" till late 18c. Meaning "go stealthily in search of prey" is first recorded 1580s. Related: Prowled; prowling. The noun, in on the prowl, is attested from 1803.
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