watch over
To guard, protect, or ensure the welfare of someone or something, often through close observation. I felt better sending the kids to camp when I knew Mrs. James would be there to watch over them. I can't help but feeling that I had an angel watching over me that day.
watch over someone or something
to keep guard over someone or something; to care for someone or something. Could you please watch over my little girl while I go to the store? I will watch over your house while you are away.
watch over
Guard for protection or safekeeping, as in There were only two aides watching over that large group of children. This idiom was first recorded in 1526.
watch over
v. To monitor and tend to someone or something: The nurses watched over the patient.