noun
Used as a noun to refer to the act of stopping or quitting something, often in phrases like 止しにする (to call it quits) or 止しだ (I quit).
今日はもう遅いから、仕事は止しにしよう。
It's already late today, so let's call it quits on work.
彼はタバコを止しにした。
He decided to quit smoking.