SUPPA-RI すっぱり
Meanings
① The way a single sword cuts through the air with a sharp and brilliant cut.
② The state of handling things with all one’s strength.
Examples
② You need to cut ties with your bad friends once and for all and get your life back on track.
悪い友達とはすっぱり縁を切って、生活を立て直すんだぞ。
② I quit smoking cigarettes once and for all after having a child.
子どもができたので、タバコをすっぱりとやめた。
Dogmatic Opinion
The image is that of a sword cutting a string with a single sword stroke, severing and separating it so that it can never be approached again.
Proximate Expression
once and for all
