two can play (at) that game

If one person can do something (often something deceptive or hurtful), so can another. This phrase typically prefaces an act of retaliation. Did she really start a rumor about me? Well, two can play that game—I'll make sure the whole school is talking about her by tomorrow morning! Stu's been getting here early to impress the boss, so here I am, too—two can play at that game!

two can play at that game

used to assert that one person's bad behaviour can be copied to that person's disadvantage.

ˌtwo can play at ˈthat game

(saying) used when you threaten to behave as badly, etc. as somebody has just behaved towards you: ‘He told the boss that you were going home early every day.’ ‘Oh did he? Well, two can play at that game. I think I’ll tell the boss about him coming in late every morning.’