1801, "given to cutting a dash" (1786), which was a colloquial expression for "acting brilliantly," from dash (n.) in the sense of "showy appearance," which is attested from 1715. The sense of "splashing" is recorded from mid-15c.
例文
1. He was the very model of the dashing RAF pilot.
彼はまさに風格のある英国王立空軍パイロットのモデルだ。
2.Two elegant Scotsmen travelling together wore dashing kilts at dinner.