TAC-AU-TAC Meaning of TAC-AU-TAC in English [ 'takəʊˌtak ]■ noun Fencing a parry combined with a riposte.Originearly 20th cent.: Fr., lit. 'clash for clash', from imitative tac . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004