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to grow hot (e.g. water); to boil
to get excited (at); to erupt (in applause, cheering, etc.); to be in a ferment; to take place energetically
to ferment
to melt (of metal)
お湯が沸いたら教えてね。
Let me know when the water boils.
会場が優勝で大きく沸きました。
The venue erupted with the championship.
やかんの水が沸いてきた。
The water in the kettle is boiling.