1860, "furnish with sandbags," from sandbag (n.). Meaning "pretend weakness," 1970s perhaps is extended from poker-playing sense of "refrain from raising at the first opportunity in hopes of raising more steeply later" (1940), which perhaps is from sandbagger in the sense of "bully or ruffian who uses a sandbag as a weapon to knock his intended victim unconscious" (1882). Hence "to fell or stun with a blow from a sandbag" (1887). Related: Sandbagged; sandbagging.
权威例句
1. With the patient prone , support the leg on a large sandbag.
患者取俯卧位, 小腿下垫一大沙袋.
2. His photo, stapled to sandbag fortifications, flutters in the breeze.
他的照片被钉在沙袋堆成的堡垒上, 在微风中飘动.
3. Sandbag , wooden dummy, tripodic dummy, suspended spring, etc.
沙袋,木人桩, 三脚桩(没听说过), 悬簧(不知是啥), 等等.
4. Children kicked sandbag , Tongxin County , Ningxia, China.