the.com/laughingstock

The one everyone mocks, usually the last to find out.

means A person who has become a target of widespread ridicule or mockery.

from A 16th-century compound of 'laughing' plus 'stock' — and that second half comes from the stocks, the wooden pillory device where offenders were locked up in public squares to be jeered at and pelted by passersby. So a laughingstock was originally imagined as someone figuratively clamped in place, put on display purely for others' amusement — the word still carries that sense of helpless, fixed exposure to mockery.

origin
once meant a person literally in the stocks, mocked
requires
an audience, not just a single mistake
social role
group cohesion built by shared contempt
reversible
redemption arcs exist, mockery rarely does
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