Origin uncertain. Perhaps from Middle English pranken (“to adorn, arrange one's attire”), probably from Middle Dutch pronken, proncken (“to flaunt, make a show, arrange one's attire”), related to German prangen (“to make a show, be resplendent”), Dutch prangen (“to squeeze, press”), Danish pragt (“pomp, splendor”), all from Proto-Germanic *pranganą, *prangijaną, *prag- (“to press, squeeze, thring”), from Proto-Indo-European *brAngh- (“to press, squeeze”). Or, perhaps ultimately related to Proto-Germanic *brahtaz, similar to Dutch pracht (“splendor”), Swedish prakt (“glory, pomp”) (loaned from Low German). Cognate with Middle Low German prunken (“to flaunt”), German prunken (“to flaunt”), Danish prunke (“to make a show, prank”). Sense of "mischievous act" from earlier verbal sense of "to be crafty or subtle, set in order, adjust". See also prink, prance, prong.