sandbag

(noun) a bag filled with sand; used as a weapon or to build walls or as ballast.

(verb) treat harshly or unfairly.

(verb) compel by coercion, threats, or crude means. Synonyms: dragoon, railroad. Example: "They sandbagged him to make dinner for everyone."

(verb) hit something or somebody as if with a sandbag. Synonyms: stun.

(verb) downplay one's ability (towards others) in a game in order to deceive, as in gambling.

(verb) protect or strengthen with sandbags; stop up. Example: "The residents sandbagged the beach front."