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Synonyms
on·slaught (ŏńslôt́, ôń-)

[Alteration (influenced by obsolete slaughte, slaughter), of Dutch aanslag, a striking at, from Middle Dutch aenslach, aen-, on, + slach, a striking.]

noun 

  1. A violent attack.
  2. An overwhelming outpouring: an onslaught of third-class mail.