Definition of onrush noun from the Oxford Advanced American Dictionary

 

onrush

 noun
noun
NAmE//ˈɑnrʌʃ//
 
, NAmE//ˈɔnrʌʃ//
 
[singular]
 
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a strong movement forward; the sudden development of something She was seized by an onrush of nerves.
See the Oxford Advanced Learner's Dictionary entry: onrush