noun
backfist; backhand strike
A martial arts technique where the back of the fist is used to strike, common in karate and similar disciplines.
空手の試合で裏拳を決めた。
He landed a backfist in the karate match.
裏拳は素早く相手の顔面を狙う技だ。
The backfist is a technique that quickly targets the opponent's face.