the.com/blunder

A blunder is a mistake that arrives wearing a marching band and zero subtlety.

means A blunder is a clumsy, careless mistake — usually obvious and consequential — made through stupidity or inattention rather than bad luck.

from From Middle English 'blundren,' to stumble or move blindly. It's likely of Scandinavian origin, a cousin of Old Norse 'blunda,' meaning to shut the eyes or doze — which captures the idea perfectly: a blunder is the error of someone moving through the world half-asleep, eyes closed, knocking things over. The same family probably gives us 'blind' and 'blunt,' all clustered around that sense of dim, fumbling unawareness.

chess sting
Marked '??' so everyone knows you actively suffered
old norse
Likely from 'blundra,' to shut one's eyes
size matters
A blunder outranks a mere slip or error
royal cousin
'Blunderbuss' means thunder-pipe, not clumsy gun
for instance

the hindenburg disaster — german zeppelin caught fire in new jersey, 1937, killing 35 of 97 aboard

new coke launch — coca-cola reformulated core product, 1985, reversed decision within 79 days due to public outcry

dewey defeats truman — chicago tribune headline called 1948 election wrong, truman won despite prediction

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