働く, はたらく
Conjugated: 働いている
Godan verb, Intransitive
1. to work, to labor, to labour
2. to function, to operate, to be effective, to work (i.e. ... works), to come into play
3. to commit (e.g. a crime), to perpetrate, to do, to act, to practise, to practice
Linguistics terminology
4. to be conjugated
彼は5時間以上もぶっ続けで働いた。