Meaning : Commit a faux pas or a fault or make a serious mistake.
Example :
I blundered during the job interview.
Synonyms : boob, drop the ball, goof, sin
Meaning : Make one's way clumsily or blindly.
Example :
He fumbled towards the door.
Synonyms : fumble
Meaning : Utter impulsively.
Example :
He blurted out the secret.
He blundered his stupid ideas.
Synonyms : blunder out, blurt, blurt out, ejaculate