This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Simple past tense and past participle of blunder.

"BILL SCHNEIDER, CNN SENIOR POLITICAL ANALYST: Well, Carol, it was the gaffe of the week and maybe the campaign when John Kerry made what he called a blundered joke about President Bush, which came out as an insult to U.S. soldiers in Iraq."

blundered    blundering    blunders   

go across    go through    pass    breach    break   

blundered    blundering   

confuse    mistake    error    bull    confusion   

Wonder    asunder    funder    plunder    sunder   

mistake    misunderstanding    inconsistency    injustice    folly