名词

1. 突如其来；猛然袭来
The onrush of something is its sudden development, which happens so quickly and forcefully that you are unable to control it.

1. (military) an offensive against an enemy (using weapons)

e.g. the attack began at dawn

Synonym: attackonslaughtonset

2. a forceful forward rush or flow

e.g. from the bow she stared at the mesmerising onrush of the sea where it split and foamed
the explosion interrupted the wild onrush of her thoughts