onrush has definitions from the field of military
1
[ noun ] (military) an offensive against and enemy (using weapons)

Examples

"the attack began at dawn"

Used in print

(J. H. Hexter, "Thomas More: On the Margins...)

But it is an answer which opens the door wide to an onrush of objections and denials .

2
[ noun ] a forceful forward rush or flow

Examples

"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"

Used in print

(Brainard Cheney, "Christianity and the Tragic Vision-Ut...)

The riotous onrush of industrialism after the War_for_Southern_Independence and the general secular drift to the Religion_of_Humanity , however , prepared the way for a reception of the French_Revolution 's socialistic offspring of one sort of another .

Related terms

rush

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