I. sand ‧ bag 1 /ˈsændbæɡ/ BrE AmE noun [countable]
a bag filled with sand, used for protection against floods, explosions etc
II. sandbag 2 BrE AmE verb ( past tense and past participle sandbagged , present participle sandbagging )
1 . [intransitive and transitive] to put sandbags around a building in order to protect it from a flood or explosion
2 . [transitive] to treat someone unfairly in order to prevent them from doing something or being successful