teach Look up teach at Dictionary.com
O.E. tęcan (past tense and pp. tęhte) "to show, point out," also "to give instruction," from P.Gmc. *taikijanan (cf. O.H.G. zihan, Ger. zeihen "to accuse," Goth. ga-teihan "to announce"), from PIE *deik- "to show, point out" (see diction). Related to O.E. tacen, tacn "sign, mark" (see token). O.E. tęcan had more usually a sense of "show, declare, warn, persuade" (cf. Ger. zeigen "to show," from the same root); while the O.E. word for "to teach, instruct, guide" was more commonly lęran, source of modern learn and lore.