[keep an eye on] or [keep one's eye on] or [have one's eye on] {v. phr.}
1. To watch carefully; not stop paying attention to.
* /Keep an eye on the stove in case the coffee boils./* /You must keep your eye on the ball when you play tennis./* /A good driver keeps his eye on the road./* /The teacher had her eye on me because she thought I was cheating./* /Billy keeps a jealous eye on his toys./* /The lion tamer keeps a sharp eye on the lions when he is in the cage./
Compare: LOOK OUT, LOOK OVER. 2. To watch and do what is needed for; mind.
* /Mother told Jane to keep an eye on the baby while she was in the store./* /Mr. Brown told John to keep an eye on the store while he was out./
Syn.: TAKE CARE OF(1).