本腰を入れる ほんごしをいれる Meanings Expression, Ichidan verb to set about in earnest; to make a strenuous effort; to put one's back into (doing) Kanji 本 origin. Read as ホン. 腰 waist. Read as こし. 入 enter. Read as いれる. Word lists Idioms Jinuma: Japanese Dictionary · Word lists