The lifeguard watched closely.

Meaning: This sentence describes how the lifeguard was looking at the swimmers very carefully or attentively.

Choice of Words: Lifeguard is a person who supervises swimmers and rescues them if they get into trouble. Watched means to look at something or someone carefully. Closely means very carefully or attentively. When you put them together, "The lifeguard watched closely" means that the lifeguard was looking at the swimmers very carefully or attentively.

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