sandbag

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A bag filled with sand and used as ballast, in the formation of protective walls, or as a weapon.
2. v. To put sandbags in or around.
3. v. To hit with a sandbag.
4. v. Slang To treat severely or unjustly.
5. v. Slang To force by crude means; coerce: sandbagged us into cleaning up their mess.
6. v. Slang To downplay or misrepresent one's ability in a game or activity in order to deceive (someone), especially in gambling: sandbagged the pool player by playing poorly in the first game when stakes were low.
7. v. Slang To downplay or misrepresent one's ability in order to deceive someone, especially in gambling.

Century Dictionary and Cyclopedia

1. n. A bag filled with sand. A bag of sand or earth, used in a fortification for repairing breaches, etc., or as ballast in boats and balloons.
2. n. A cylindrical tube of flexible and strong material filled with sand, by which a heavy blow may be struck which leaves little or no mark on the skin: a weapon used by ruffians.
3. n. A bag of sand which was attached to a quintain.
4. n. A long narrow bag of fiannel, filled with sand, used to cover crevices between window-sashes or under doors, or laid on the stage of a theater behind flats and wings to prevent lights at the back from shining through the spaces left at junctions.
5. To hit or beat with a sand-bag.

Wiktionary

1. n. a bag, filled with sand, that can be used to weigh something down, to make a defensive wall against flooding etc, or as a weapon
2. v. To construct a wall of sandbags (around something).
3. v. transitive To strike someone with a sandbag or other object to disable or render unconscious.
4. v. transitive To deceive someone by pretending to be weak, or (in cards) to have a weak hand.
5. v. To pretend to drink early on so that as the night draws on one can drink everyone "under the table".

GNU Webster's 1913

1. n. A long bag filled with sand, used as a club by assassins.
2. n. A bag filled with sand; small sandbags may be used as a weapon, or larger ones to build walls or as ballast.
3. v. To treat harshly or unfairly.
4. v. To hit something or somebody with or as if with a sandbag.
5. v. To protect or strengthen with sandbags; stop up.
6. v. informal To thwart (another person's plans) by surreptitious maneuvers.
7. v. Informal To intimidate or coerce, especially by crude methods.
8. v. Informal To deceive and take advantage of (a person) by misrepresenting one's true intentions.
9. v. (Poker) To encourage opponents into betting more by first refraining from betting while having a strong hand, and only later raising the stakes. In informal games, certain types of sandbagging are forbidden.

WordNet 3.0

1. v. hit something or somebody as if with a sandbag
2. v. downplay one's ability (towards others) in a game in order to deceive, as in gambling
3. v. treat harshly or unfairly
4. v. protect or strengthen with sandbags; stop up
5. v. compel by coercion, threats, or crude means
6. n. a bag filled with sand; used as a weapon or to build walls or as ballast