From Middle English theft, thefte, þefte, þefþe, þiefþe, Old English þīefþu, from Proto-West Germanic *þiubiþu, from Proto-Germanic *þiubiþō, from *þeubaz, equivalent to thief + -th or thieve + -th. Cognate with Old Frisian thiuvethe, thiufthe, dialectal Dutch diefte, obsolete German Diebde, Icelandic þýfð.
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