ON'SET, n. [on and set.] 1. A rushing or setting upon; a violent attack; assault; a storming; appropriately, the assault of an army or body of troops upon an enemy or a fort.The shout of battle now began and rushing sound of onset.2. An attack of any kind; as the impetuous onset of grief.ON'SET, v.t. To assault; to begin. [Not used.]
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