N-SING 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. 突如其来;猛然袭来
The onrush of tears took me by surprise. [+ of]
我没料到自己竟一下子泪如泉涌。
She was screwing up her eyes against the onrush of air. [+ of]