1
: a strong, fast movement forward
—usually + of
an onrush of water/traffic
2
: a sudden development or appearance of something
—usually + of
the onrush of new technologies
an onrush of tears/memories
Cite this Entry
“Onrush.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/onrush. Accessed 22 Jun. 2026.
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