Noun

1. A swordsman or fencer, that engages in showy or extravagant sword play.

   Quotations

   • 1786: Phillips, in his New World of Words defines, to swash, to make fly about; to clash, or make a noise with swords; and a swash-buckler, a vain glorious sword player or fencer, a meer braggadochoe, a vapouring fellow. — Francis Grose, A Treatise on Ancient Armour and Weapons, page 80.

2. A daring adventurer.
3. A kind of period adventure story with flashy action and lighthearted tone.