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blunder (v.)

mid-14c., "to stumble about blindly," from a Scandinavian source akin to Old Norse blundra "shut one's eyes," perhaps from Proto-Germanic *blinda- "blind" (see blind (adj.)). Meaning "make a stupid mistake" is first recorded 1711. Related: Blundered; blundering.

blunder (n.)

late 14c., blonder, blunder, "disturbance, strife; trouble, distress;" apparently from blunder (v.). Original sense obsolete. Meaning "a mistake made through hurry or confusion" is from 1706.

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Definitions of blunder from WordNet
1
blunder (v.)
commit a faux pas or a fault or make a serious mistake;
I blundered during the job interview
Synonyms: drop the ball / sin / boob / goof
blunder (v.)
make one's way clumsily or blindly;
Synonyms: fumble
blunder (v.)
utter impulsively;
He blundered his stupid ideas
Synonyms: blurt out / blurt / blunder out / ejaculate
2
blunder (n.)
an embarrassing mistake;
Synonyms: blooper / bloomer / bungle / pratfall / foul-up / fuckup / flub / botch / boner / boo-boo
From wordnet.princeton.edu