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Old English hwa, from Proto-Germanic *khwas, *khwes, *khwo (cf. Old Saxon hwe, Danish hvo, Swedish vem, Old Frisian hwa, Dutch wie, Old High German hwer, German wer, Gothic hvo (fem.) "who"), from PIE *kwo- (cf. Sanskrit kah "who, which;" Avestan ko, Hittite kuish "who;" Latin quis/quid "in what respect, to what extent; how, why," qua "where, which way," qui/quae/quod "who, which;" Lithuanian kas "who;" Old Church Slavonic kuto, Russian kto "who;" Old Irish ce, Welsh pwy "who").
: Then the whiz-kid lawyers collided with a tougher adversarynoun phrase
A very clever young person; a youthful prodigy: the physics whiz kid (1930s+)
[fr whiz1 blended with quiz kid, ''very bright child or young person,'' used of participants in a 1930s radio quiz program]