a forceful forward rush or flow; "from the bow she stared at the mesmerising onrush of the sea where it split and foamed"; "the explosion interrupted the wild onsrush of her thoughts"
(military) an offensive against an enemy (using weapons); "the attack began at dawn"
The onrush of something is its sudden development, which happens so quickly and forcefully that you are unable to control it. The onrush of tears took me by surprise She was screwing up her eyes against the onrush of air. = surge. a strong fast movement forward, or the sudden development of something onrush of
Onrushing describes something such as a vehicle that is moving forward so quickly or forcefully that it would be very difficult to stop. He was killed by an onrushing locomotive. the roar of the onrushing water