sandbag

Hit something or somebody as if with a sandbag.

Compel by coercion, threats, or crude means.

“They sandbagged him to make dinner for everyone”

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

Protect or strengthen with sandbags; stop up.

“The residents sandbagged the beach front”

Treat harshly or unfairly.

A bag filled with sand; used as a weapon or to build walls or as ballast.