What is the meaning of blunder? - Question about English (US)

Blunders in Test Automation

Meaning of blunder with pronunciation - English 2 Bangla / English Dictionary

Types of Error — Overview & Comparison - Expii

Can you tell me why this is not a blunder? : r/chess

Um. . .: Slips, Stumbles, and Verbal Blunders, and What They Mean: Erard, Michael: 9780375423567: : Books

Developer Blunders — Making Your Scrum Work #14

Please show me example sentences with screw up(An example sentence as a meaning of definition is ''make a mistake;blunder'').

Solved Weekly demand for loaves of Blunder Bread at a Kroger

Blunder - Super Mario Wiki, the Mario encyclopedia

I'm wondering why is this a blunder? I mean d5 removes mate threat more efficiently and here bishup is kinda hard to get rid of, but this doesn't seem like a blunder