From The Collaborative International Dictionary of English v.0.48 [gcide]:
Tac-au-tac \Tac'-au-tac"\, noun [F., fr. riposter du tac au tac to parry (where tac imitates the sound made by the steel).] (Fencing) The parry which is connected with a riposte; also, a series of quick attacks and parries in which neither fencer gains a point. [Webster 1913 Suppl.]
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