Ouch! What’a a pin doing here? 痛っ！なんでこんなところにピンが？

Definition

to put a pin in it: to take a break from discussing some topic, with plans to resume the discussion later

to put a pin in it: 話を保留にする、また後で話す

Example

I have more to say, but I have to take this call, so let’s put a pin in it for now.

言いたいことはまだありますが、この電話は出ないといけないので、また後で話しましょう。