/ əʊf; NAmE oʊf/ noun
a stupid, unpleasant or awkward person, especially a man :
Mind that cup, you clumsy oaf!
► oaf·ish adjective
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WORD ORIGIN
early 17th cent.: variant of obsolete auf , from Old Norse álfr elf. The original meaning was elf's child, changeling , later idiot child and halfwit , generalized in the current sense.