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

   to boil; to seethe

   Usually written using kana alone

2. to roil (e.g. waterfall, torrent); to foam; to cascade down

   Usually written using kana alone

3. to well up (of emotions); to overflow (e.g. fighting spirit); to seethe (esp. blood)

   Usually written using kana alone

Also written 激る【たぎる】tagiru