Probably ultimately from French quatre ("four"), possibly via cater, although Liberman argues for a derivation from a North Germanic prefix meaning "crooked, angled, clumsy" from which he also derives cater-cousin and, via Norse, Old Irish cittach. He finds this more likely than extension of the dice and change-ringing term cater as an adverb, given the likely cognates in other Germanic languages. caterpillar and caterwaul are unrelated, being derived from cognates to cat, but may have influenced the pronunciation of Liberman's proposed earlier *cate- or undergone similar sound changes.