On"set` (?), n. [On +
set.] 1. A rushing or setting upon; an
attack; an assault; a storming; especially, the assault of an
The onset and retire Shak.
Of both your armies.
Who on that day the word of onset
2. A setting about; a beginning. [Obs.]
There is surely no greater wisdom than well to time
the beginnings and onsets of things.
3. Anything set on, or added, as an ornament
or as a useful appendage. [Obs.] Johnson.
On"set`, v. t. 1.
To assault; to set upon. [Obs.]
2. To set about; to begin. [Obs.]