Verb (5-dan, く, intransitive)
1. to work; to labor; to labour
こちらで働いていた。I was working here.
2. to function; to operate; to be effective; to work (i.e. ... works); to come into play
しかし、全然、頭が働かない。However, my mind is not working at all.
3. to commit (e.g. a crime); to perpetrate; to do; to act; to practise; to practice
いきなり無礼を働いて申し訳ない。I am sorry for suddenly being so rude.
4. to be conjugated