Meaning

noun a sudden and severe onset of trouble

noun (military) an offensive against an enemy (using weapons)

noun the rapid and continuous delivery of linguistic communication (spoken or written)

originFrom on- + slaught. Formed after Middle Dutch aenslag, aenslach, equivalent to aen + slag, although slaught corresponds to Middle Dutch slacht; slag is cognate with the English weaving term sley. Compare Dutch aanslag and German Anschlag.

Etymology from Wiktionary, CC BY-SA 3.0