It is called sandbagging and the verb is to sandbag It

sandbagging poker
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Predictions from poker are invalid in such nonzero-sum games Blu¢ng occurs when a weak player

Sandbagging is a technique with origins in the 1880s, a famous term in poker and, in recent times, golf So, what are sandbagging sales?

que es poker en el futbol sandbag · Poker to deceive into remaining in the pot by refraining from betting on a strong hand, then raising the bet in a later round

poker snap 7 to sandbag an opponent in poker sand′bag`ger, n Random House Kernerman Webster's College Dictionary, © 2010