Grammar fix
keep an eye out for
watch for something
To stay aware so that you notice someone or something when it appears.
How oftenCommon
LevelB1
Used inSpeech & writing
Hear it in context
Notice where the phrase sounds natural.
Keep an eye out for a small blue envelope in the post.
When I travel by train, I keep an eye out for my stop because some of the smaller stations are easy to miss.
Fix the pattern
One small grammar move makes it sound right.
Not: Please keep an eye for my parcel.
Say: Please keep an eye out for my parcel.
The idiom includes 'out': 'keep an eye out for something'.
Don't confuse it
Other ways to say it
Watch carefully for someone or something
How alertCasualOn guard
keep an eye out forYou're here · Casually ask someone to notice something if it appears.
look out forWatch for something you need to notice or avoid.be on the lookout forEmphasizes staying alert for a particular person or thing.