Keep An Eye On + Keep An Eye Out
Keep an Eye On Something/Someone
= to watch, to pay attention to
Ex: Please “keep an eye on” your little brother while we are gone. I don’t want him to get hurt, or get into trouble.
Ex: When you play baseball, the coach always says to “keep an eye on” the ball.
Keep an Eye Out For Something/ Someone
= to look for, wait to see
Ex: “Keep an eye out” for the mail because I’m expecting a letter.
Ex: “Keep an eye out” for my shirt. I lost it and can’t remember where I put it.
