thieve v. + Add to list US //ˈθiv// UK //θˈiːv// thieve SynonymsEtymology Synonyms copglomhooksnitchOriginOEþēofian→ME*theven→ENthieve From Middle English *theven [found in Middle English thevinge (“thieving”)], from Old English þēofian, ġeþēofian, ġeþīefian (“to thieve, steal”).