you are right on the button

那天我說了兩個句子，然後問我朋對不對結果她說 you are right on the button 我問為何用button,她說來自加拿大人打冰壺運動。中文的對應我不會，請教各位。

Idiom:

 

on the button

exactly right; in exactly the right place; at exactly the right time. That's it! You're right on the button. He got here at one o'clock on the button.

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