Meaning

noun elegance by virtue of being fashionable

verb display proudly; act ostentatiously or pretentiously

adjective imposingly fashionable and elegant

originFrom dialectal swank (“to strut, behave ostentatiously”), perhaps from an unrecorded Old English root, derived from Proto-Germanic *swankijaną (“to cause to sway, swing”) or from Proto-Germanic *swankaz (“lithe, bendsome, slender”), related to the Scots swank and the Middle High German swanken, modern German schwanken (“to sway”).

Etymology from Wiktionary, CC BY-SA 3.0