rushing into; breaking into; storming
plunging into (war, etc.); embarking on (a new venture)
警察が建物に突入した。
The police stormed the building.
突入を試みたが阻まれた。
They attempted to break in but were stopped.
シーズン佳境に突入して選手たちの気迫が増した。
As the season reached its peak, the players' intensity grew.