blunder in WordNet English dictionary

1. an embarrassing mistake
   blunder  blooper  bloomer  bungle  pratfall  foul-up  fuckup  flub  botch  boner  boo-boo 
   

1. utter impulsively
   "He blurted out the secret"; "He blundered his stupid ideas"
   blurt out  blurt  blunder out  blunder  ejaculate 
   
2. make one's way clumsily or blindly
   "He fumbled towards the door"
   fumble  blunder 
   
3. commit a faux pas or a fault or make a serious mistake
   "I blundered during the job interview"
   drop the ball  sin  blunder  boob  goof