What does blunder mean?

Intermediate+ Word of the Day: blunder – WordReference Word of the Day

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How is this move by my opponent not a blunder? - Chess Forums

Prasanna S on X: 6. The blunder appears to be that the edits offered by the judgment were not replayed accurately on the provision. Crucially, the word 'State' has been omitted, giving

Unscramble BLUNDER - Unscrambled 119 words from letters in BLUNDER

Rhetorical Question Blunder - TV Tropes

What does this mean : r/PizzaTower

Daily Vocabulary from 'The Hindu': July 24, 2023

Would anyone care to explain why 0-0 was a blunder? - Chess Forums