Word Origin & History
eight
O.E. eahta, æhta, from P.Gmc. *akhto(u) (cf. O.N. atta, Ger. acht, Goth. ahtau), from PIE *okto (cf. Gk. okto, L. octo, O.Ir. ocht-n, Bret. eiz, Skt. astau, Avestan ashta). Klein calls it "an old dual form, orig. meaning 'twice four.' " Meaning "eight-man crew of a rowing boat" is from 1847. The Spanish piece of eight (1699) was so called because it was worth eight reals. To be behind the eight ball "in trouble" (1932) is a metaphor from shooting pool. Eighteen is O.E. eahtatene; eighty is O.E. hundeahtatig, from hund- "ten." Eighty-six, slang for "eliminate" (1936), originated as lunch counter slang, a cook's word for "none" when asked for something not available, probably rhyming slang for nix.