onslaught

[ on-slawt, awn- ]
/ ˈɒnˌslɔt, ˈɔn- /

noun

an onset, assault, or attack, especially a vigorous one.

Origin of onslaught

1615–25; < Dutch aanslag a striking, (earlier) attack (equivalent to aan on + slag blow, stroke; akin to slay), with assimilation to obsolete slaught slaughter
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for onslaught

onslaught

/ (ˈɒnˌslɔːt) /

noun

a violent attack

Word Origin for onslaught

C17: from Middle Dutch aenslag, from aan on + slag a blow, related to slay
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012