Dictionary / Vocabulary / 仕事の虫
しごとのむし
workaholic; person who is totally devoted to his work
彼のことを仕事の虫だと言うけれど、仕事をしているときが一番楽しいという人間もいるんだよ。
You say he is a workaholic, but you know there are some people who feel happiest when they're working.