phrase(alsobe on guard) to be responsible for protecting someone or something, or for preventing someone from escaping: 守卫；站岗；看守 keep guard overTwo of the soldiers kept guard over the captured guns.两名士兵看守着缴获的枪支。 Armed police stand guard outside the house.武装警察在房外守卫。 stand guard overA number of armed officers stood guard over twenty or so prisoners. They were standing guard over the building when we arrived. We took turns to keep guard over the treasure. Nearly 20 men were on guard that night. See also