To keep an eye on something means to watch it carefully or check on it to make sure nothing goes wrong. It often involves looking after something or someone for a short time.
The phrase comes from the simple idea of using your eyes to observe something closely. Over time it became a common way to describe monitoring or supervising.
The phrase comes from the simple idea of using your eyes to observe something closely. Over time it became a common way to describe monitoring or supervising.
Could you keep an eye on the dog while I run to the store?