sandbag - noun

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

sandbag - verb

• treat harshly or unfairly
• compel by coercion, threats, or crude means
• hit something or somebody as if with a sandbag
• downplay one's ability (towards others) in a game in order to deceive, as in gambling
• protect or strengthen with sandbags; stop up

sandbag - thesaurus

dragoon   railroad   stun