tit for tat

Uncertain; conjectured to be ultimately from Dutch dit voor dat (“this for that”) or French tant pour tant (“equal for equal”). Compare earlier tip for tap (“(a) blow for (a) blow”), from tip + tap; compare also dialectal tint for tant and tit (“a light blow or hit”). The vowel sequence follows a typical ablaut reduplication pattern.

• "If you hit me, I’ll hit you back; tit for tat."
• "Tit for tat is the policy of cooperating on the first move and then doing whatever the other player did on the previous move. This policy means that tit for tat will defect once after each defection of the other player."
• "Could it but for a longer Space / Lengthen the Bliſs it let's us taſte, / Who would not doat on't? But alas! / The Joy's too exquiſite to laſt. / Two white Herculean Pillars prop / The tufted Gin, the tempting Snare; / When they divide, then in we pop, / Before we well know where we are. / Then that for this, and tit for tat; / But when the pleaſing Minute's flown, / As uſeleſs it returns the Bait, / And both look fooliſh when 'tis done."
• "This is but Tit for Tat, young Gentleman. Your Father wanted to get my Eſtate from me; and I have got the Wife he intended for you. All's fair, Sir."
• ""You'll never get her over like that. You must coax her." / "Coax the devil. Do you think I'm going to be beat by a horse?" / "It would only be tit for tat; you beat her, so she has a right to beat you.""
• "YVETTE. I have no idea what to make Monsieur for dinner. / FOLLBRAGUET. (beside himself) Well, that's no skin off my ass, damn it! / YVETTE. (snippily, giving him tit for tat) Well, it's certainly no skin off mine, Monsieur!"
• "As part of the planning for a new initiative on Cuba, the NSC [National Security Council] also revived the concept of "calibrated response." A new staffer was tasked to develop a list of "tit-for-tats" with Cuba—which sanctions might be lifted or softened in response to clear steps toward democracy by the [Fidel] Castro regime."
• "China Warns of ‘Tit for Tat’ on iPhone Sales if Trump Starts Trade War"

• eye for an eye
• a Roland for an Oliver

• quid pro quo