to throw oneself into a river―drown oneself in a river―commit suicide
身を投げる - 斎藤和英大辞典
to bind oneself (to do something)―commit oneself (to a line of conduct)
言質を取られる - 斎藤和英大辞典
to do wrong―misdemean oneself―forget oneself―commit an imprudence―commit an indiscretion
心得違いをする - 斎藤和英大辞典
to devote oneself to―commit oneself to―the cause of education
教育に一身を投ずる - 斎藤和英大辞典
(英語研究になら)to devote oneselfto the study of English―(教育事業になら)―commit oneselfto the cause of education
身を委する - 斎藤和英大辞典
to misdemean oneself―forget oneself―commit an imprudence―commit an indiscretion―make a mistake―do wrong
不心得なことをする - 斎藤和英大辞典
tocommit suicide by drowning oneself (川,谷や線路に)飛び込んで自殺を図る - EDR日英対訳辞書
tocommit suicide by shooting oneself in the stomach
鉄砲で自分の腹を撃って自殺すること - EDR日英対訳辞書
The reason for this was that if one slice ('hito-kire' which also means to kill someone) of takuan was served the samurai would become angry and said, 'Are you trying to tell me to kill someone,' and, if three slices ('mi-kire' which also means to cut oneself or tocommit harakiri) of takuan was served the samurai would also become angry and said, 'Are you trying to tell me tocommit harakiri?'
それは、沢庵を一切れだけ出した場合、侍は「一切れ(人を斬れ)と申すのか!」と怒り出し、また、三切れ出した場合は「三切れ(身斬れ、つまり腹を切る)と申すのか!」と怒り出すためである。 - Wikipedia日英京都関連文書対訳コーパス