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onslaught

[on-slawt, awn-] /ˈɒnˌslɔt, ˈɔn-/
noun
1.
an onset, assault, or attack, especially a vigorous one.
Origin of onslaught
1615-1625
1615-25; < Dutch aanslag a striking, (earlier) attack (equivalent to aan on + slag blow, stroke; akin to slay), with assimilation to obsolete slaught slaughter
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British Dictionary definitions for onslaught

onslaught

/ˈɒnˌslɔːt/
noun
1.
a violent attack
Word Origin
C17: from Middle Dutch aenslag, from aanon + slag a blow, related to slay
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for onslaught
n.

1620s, anslaight, somehow from or on analogy of Dutch aanslag "attack," from Middle Dutch aenslach, from aen "on" (see on) + slach "blow," related to slaen "slay." Spelling influenced by obsolete (since c.1400) English slaught (n.) "slaughter," from Old English sleaht (see slaughter (n.)). No record of its use in 18c.; apparently revived by Scott.

Online Etymology Dictionary, © 2010 Douglas Harper
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