to boil; to seethe
to roil (e.g. waterfall, torrent); to foam; to cascade down
to well up (of emotions); to overflow (e.g. fighting spirit); to seethe (esp. blood)
選手の闘志がたぎっている。
The athlete's fighting spirit is burning hot.
不当な判決を聞き、彼の血が滾った。
Hearing the unjust verdict, his blood boiled.
岩間から勢いよく湧き出る温泉は、激しく滾る。
The hot spring water gushing powerfully from the rock face boils fiercely.