prank 1 (prāngk) n. A mischievous trick or practical joke.
[Origin unknown.]
prank 2 (prāngk) v.
pranked, prank·ing, pranks
v.
tr. To decorate or dress ostentatiously or gaudily. v.
intr. To make an ostentatious display.
[From Middle English pranken, to show off, perhaps from Middle Dutch pronken (from pronk, show, display) and from Middle Low German prunken (from prank, display).]