—n. 1. a bag filled with sand, used in fortification, as ballast, etc.
2. such a bag used as a weapon.
—v.t. 1. to furnish with sandbags.
2. to hit or stun with a sandbag.
3. Informal. a. to set upon violently; attack from or as if from ambush.
b. to coerce or intimidate, as by threats: The election committee was sandbagged into nominating the officers for a second term. c. to thwart or cause to fail or be rejected, esp. surreptitiously or without warning: He sandbagged our proposal by snide remarks to the boss. 4. Poker.to deceive (one or more opponents) into remaining in the pot by refraining from betting on a strong hand, then raising the bet in a later round.