on·set /-ˌsɛt/
 開始,著手;攻擊,突擊
 on·set /ˈɔnˌsɛt, ˈɑn-/ 名詞
 On·set n.
 1. A rushing or setting upon; an attack; an assault; a storming; especially, the assault of an army.
 The onset and retire
 Of both your armies.   --Shak.
    Who on that day the word of onset gave.   --Wordsworth.
 2. A setting about; a beginning; -- used especially of diseases or pathological symptoms.
    There is surely no greater wisdom than well to time the beginnings and onsets of things.   --Bacon.
 3. Anything set on, or added, as an ornament or as a useful appendage. [Obs.]
 On·set, v. t.
 1. To assault; to set upon. [Obs.]
 2. To set about; to begin. [Obs.]
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 onset
      n 1: the beginning or early stages; "the onset of pneumonia"
           [syn: oncoming]
      2: (military) an offensive against an enemy (using weapons);
         "the attack began at dawn" [syn: attack, onslaught, onrush]