What does "keep an eye on" mean?

The phrase "keep an eye on" means to monitor something or someone, suggesting a sense of vigilance or attentiveness. It implies that you should observe closely to ensure that everything is under control or to watch out for any changes or issues that might arise. This expression is often used in various contexts, such as watching over a child, keeping track of a project’s progress, or being alert to a particular situation. By focusing on the action of watching and being aware, it embodies the idea of active involvement in safeguarding or overseeing something.