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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From on- + rush. Compare Middle English onresen (“to rush upon; attack”), from Old English onrǣsan (“to rush, rush on”); Old English onrǣs (“an onrush, assault, attack”).
attack, onslaught, onset
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Classic usage
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