Parents watch closely.
Meaning: This means that the parents are keeping a close eye on their children. It's like saying, The parents are watching their children carefully.
Choice of Words: Parents are the people who have brought a child into the world and have the responsibility of raising and caring for that child. Watch is a verb that means to look at something carefully or attentively. Closely is an adverb that means in a way that is very attentive or careful. When you put them together, "Parents watch closely" is a description of parents paying close attention to what their children are doing.
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Related Expressions