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1.
To treat harshly or unfairly.
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2.
To hit something or somebody with or as if with a sandbag.
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3.
To protect or strengthen with sandbags; stop up; as, the residents sandbagged the beach front.
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4.
To thwart (another person's plans) by surreptitious maneuvers; as, he sandbagged my proposal by talking in private with other members of the committee.[informal]
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5.
To intimidate or coerce, especially by crude methods.[Informal]
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6.
To deceive and take advantage of (a person) by misrepresenting one's true intentions.[Informal]
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7.
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.(Poker)