To show off or boast about something in a way that seems showy or arrogant; to display ostentatiously.
Of uncertain origin, possibly from Middle Low German swank meaning 'to sway or bend.' First appeared in English in the 17th century. The meaning shifted from physical movement to showiness and boasting behavior.
Swank perfectly captures the awkwardness of showing off—it's not just bragging, but doing it in a conspicuous, almost physical way, like you can't help but bend and sway with your own importance. British English kept this word alive while Americans mostly forgot it, which is why it sounds delightfully dated.
Complete word intelligence in one call. Free tier — 50 lookups/day.