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Old English utlaga "one put outside the law" (and thereby deprived of its benefits and protections), from a Scandinavian source, cf. Old Norse utlagi (n.) "outlaw," from utlagr (adj.) "outlawed, banished," from ut "out" (see out (adv.)) + *lagu, plural of lag "law" (see law).
[G]if he man to deaðe gefylle, beo he þonne utlah ["Laws of Edward & Guthrum," c.924]Meaning "one living a lawless life" is first recorded 1880. As an adjective from Old English.
Old English utlagian "to outlaw, banish," from utlaga "an outlaw" (see outlaw (n.)). Related: Outlawed; outlawing.