1. Godan verb with 'ku' ending, Intransitive verb

   1.

   to grow hot (e.g. water); to boil

2. 2.

   to get excited (at); to erupt (in applause, cheering, etc.); to be in a ferment; to take place energetically

3. 3.

   to ferment

Example sentences

• トムは、やかんが沸くのを待っていました。

  Tom waited for the kettle to boil.

• トムは、やかんの湯が沸くのを待ってました。

  Tom waited for the kettle to boil.