the.com/bettor

Someone who pays cash for the thrill of being wrong with confidence.

means A person who stakes money on the outcome of an uncertain event, like a game or a race.

from Simply 'bet' plus the agent suffix '-or'. The word 'bet' itself appeared in English in the late 1500s, likely clipped from 'abet' — meaning to encourage or back someone — though its exact root is debated. So a bettor is, at heart, someone who backs their own belief with hard cash.

spelling tell
bettor bets, better improves — the house loves the confusion
house edge
casinos profit even if every bettor sometimes wins
self delusion
most remember wins vividly, forget losses conveniently
sharp vs square
sharps bet the number, squares bet the feeling
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