拳 is one of the most commonly used Japanese kanji, and it also has a lot of special readings in addition to the standard onyomi and kunyomi readings.
ONYOMI 音読み
こぶし kobushi
KUNYOMI 訓読み
ケン ken ゲン gen
Examples
おまえも決して戦う拳を忘れるな。Never lose your fighting fists.彼は拳で私の顔面を殴った。He struck me in the face with his fist.彼らにこぶしで殴りかかった。He went at them with his fists.握った拳はストレスを示すこともある。A closed fist can indicate stress.彼女は拳でテーブルをドンと叩いた。She banged the table with her fist.私に殴ろうとするかのように彼女はこぶしを上げた。She raised her fist as if to hit me.演説者はこぶしでテーブルをどんとたたいた。The speaker banged the table with his fist.「相変わらず短気だな」麗華の拳をいなしながら言う。“Short tempered as ever.” He said while dodging Reika’s fist.