Keep an eye on

Meaning/Usage: To watch after; to supervise; to take care of

Explanation: When you have your eye on something or you are watching something, then you are paying attention to something or someone.

"Can you keep an eye on my daughter while I go get the car?"
"Don't worry about your luggage. I'll keep an eye on it."
"My mom will keep an eye on our equipment while we go get the truck."

A: "Excuse me sir."
B: "Yes."
A: "I have to go to the bathroom. Can you keep an eye on my suitcase for a minute?"
B: "No problem."

Other Common Sentences

"Can you watch my bag for me?"
"Can you watch my suitcase while I go to the bathroom."