Odds & prices
Chalk (chalky)
Slang for the favorite, especially a heavy one; a “chalk bettor” habitually backs favorites, and a slate or parlay full of favorites is “chalky.” The term survives from pre-digital racetracks, where the most-bet horse's shortening odds were rewritten on chalkboards.
Chalk-heavy betting produces high win rates and, frequently, slow losses to the vig: favorites win often but pay less than they cost, so the margin for error is thin.
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