Etymology
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dashing (adj.)

1796, "performed with dash, impetuous;" from 1801 as "given to cutting a dash," a colloquial expression attested from 1786 (see cut (v.)) for "acting brilliantly," from dash (n.) in the sense of "showy appearance" (1715). Earlier in the sense of "splashing" (1620s), which replaced dashende (mid-15c.) as a present-participle adjective. Related: Dashingly.

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Definitions of dashing

dashing (adj.)
lively and spirited;
a dashing hero
Synonyms: gallant
dashing (adj.)
marked by up-to-dateness in dress and manners;
Synonyms: dapper / jaunty / natty / raffish / rakish / spiffy / snappy / spruce
From wordnet.princeton.edu