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keep (close) watch (over someone or something)
to guard or care for someone or something. I'm keeping watch over my children to make sure they have the things they need. I think that an angel is keeping close watch over her to make sure nothing bad happens to her.
Also, keep a watch or close watch on ; watch over. Observe with continuous attention, especially to act as a sentinel or for protection. For example, Afraid that the wolves would return, she kept watch while the others slept, or They kept a close watch on the harbor, looking for signs of enemy ships, or, according to the Gospel of St. Luke (2:8): "And there were in the same country shepherds ... keeping watch over their flock by night." [Late 1300s] Also see keep an eye out for.