Meaning

noun an embarrassing mistake

verb commit a faux pas or a fault or make a serious mistake

verb make one's way clumsily or blindly

originInherited from Middle English blundren, blondren (verb) and blunder, blonder (“disturbance, strife”), from the verb; partly from Middle English blondren, a frequentative form of Middle English blonden, blanden ("to mix; mix up"; corresponding to blend + -er); and partly from Middle English blundren, a frequentative form of Middle English blunden (“to stagger; stumble”), from Old Norse blunda (“to…

Etymology from Wiktionary, CC BY-SA 3.0