onslaught

[on-slawt, awn-]
noun
an onset, assault, or attack, especially a vigorous one.

Origin:
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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World English Dictionary
onslaught (ˈɒnˌslɔːt)
 
n
a violent attack
 
[C17: from Middle Dutch aenslag, from aanon + slag a blow, related to slay]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

onslaught
1625, anslaight, somehow from or on analogy of Du. aanslag "attack," from M.Du. aenslach, from aen "on" + slach "blow," related to slaen "slay." Spelling infl. by obs. (since c.1400) Eng. slaught (n.) "slaughter," from O.E. sleaht (see slaughter). No record of its use
in 18c.; apparently revived by Scott.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
His cellular plan included unlimited text messages, so the onslaught did not
  run up his bill.
Several property and casualty insurers collapsed under the onslaught of claims.
Such a movie might suggest ways to protect the solid from the neutron onslaught.
And don't think that the ocean is off limits to gravity's onslaught.
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