Definition of tac-au-tac in English:

tac-au-tac

noun

Fencing
  • A parry combined with a riposte.

    • ‘To disarm an adversary counts for nothing, but a tac-au-tac riposte against a disarmed adversary is good.’
    • ‘The retort was in the nature of the tac-au-tac riposte beloved of the skilled swordsman.’

Origin

Early 20th century: French, literally clash for clash, from imitative tac.

Pronunciation:

tac-au-tac

/ˈtakəʊˌtak/