Sentence:  Phillips, in his New World of Words defines, to swash, to make fly about; to clash, or make a noise with swords; and a <WSD>swash-buckler</WSD>, a vain glorious sword player or fencer, a meer braggadochoe, a vapouring fellow. 
Meaning of the word marked with <WSD> tags:  A swordsman or fencer who engages in showy or extravagant sword play.