sandbag

Etymology

From sand + bag.

noun

1. A sturdy sack filled with sand, generally used in large numbers to make defensive walls against flooding, bullets, or shrapnel.
2. A small bag filled with sand and used as a cudgel.
3. An engraver's leather cushion, etc.
4. (poker) A deceptive play whereby a player with a strong hand bets weakly or passively.

verb

1. (transitive) To construct a barrier of sandbags around.
   We sandbagged the basement windows against the floodwaters.
2. (transitive) To strike someone with a sandbag or other object to disable or render unconscious.
3. To conceal or misrepresent one's true position, potential, or intent in order to gain an advantage.
   1. (transitive) To deceive someone by pretending to be weak, or (card games) by pretending to have a weak hand.
   2. To pretend to drink early on so that, as the night draws on, one can drink everybody else "under the table".