sandbag

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But allow me to pause for a moment and throw another sandbag on the levee of those trying to resist this tide.
但请容许我暂停片刻，在试图抵挡这股潮流的堤坝上再添一个沙袋。
8Illinois, USA: A woman stands on a pile of sandbags as others help her sandbag her flooded home in Olive Branch Photograph: Jeff Roberson/AP
12美国伊利诺州（Illinois USA）：奥利夫布兰奇一妇女正站在一堆沙袋上，旁边是几位帮着她用沙袋堵住洪水淹没家园的人。
Commuters hurried along the sidewalk toward the entrance, passing a war-zone-like vision of a guard hunkered behind a sandbag bunker, his gun pointing outward.
人们朝着入口沿着人行道快速通过，像是在战区有守在沙袋后的卫兵盯着他们一样。

The Fed's sandbag strategy will help ward off disaster, but it won't shore up a sagging economy.
ECONOMIST: Credit crunch
Crews scrambled to patch trouble spots and build a second sandbag wall to catch any water weaseling through.
NPR: More Rain Expected For Already Swollen Rivers
"The water is continuing to rise but it is our full hope and expectation that these walls will hold, " Nixon said of the sandbag levees.
NPR: Crests Approaching In Several Towns In Midwest

A sandbag is a cloth bag filled with sand. Sandbags are usually used to build walls for protection against floods or explosions.
To sandbag something means to protect or strengthen it using sandbags.