In the 19th century, the verb sandbag began to be used to describe the act of bludgeoning someone with a small, sand-filled bag—a tactic employed by ruffians, usually as a prelude to robbing their victims. The verb went on to develop metaphorical extensions, such as "to coerce by crude means." By the 1940s, it was being used of a strategy in which a poker player with a good hand bets weakly, in order to draw other players into holding on to their hands and raising the bet. The use of sandbag has since evolved to refer to a general strategy of playing down one's position in order to gain some sort of advantage.