Verb (5-dan, く, intransitive)
1. to grow hot (e.g. water); to boil
お風呂わいたから、順に入っちゃってくれる?The bath is ready, so could you all take turns getting in?
2. to get excited (at); to erupt (in applause, cheering, etc.); to be in a ferment; to take place energetically
3. to ferment
4. to melt (of metal)