"To keep an eye out for somebody", what does it mean?
Is it to keep an eye on somebody or just the contrary?
Thank you!

Question

Answer

The two can also have subtley different meanings.

"To keep an eye OUT FOR somebody" can mean you're looking after them, making sure they aren't harmed. "To keep an eye ON somebody" can mean you don't trust the person.

If there's someone you don't trust or you think may be trouble in the future, you may say to them "I'm keeping my eye on you".

Answer

If are to meet your friend at a crowded bus station you would be keeping an eye out for him.

Answer

keep an eye open/out (for something) to watch carefully so that you will notice when someone or something appears: 
Keep an eye out for rabbits in the field. See here some expressions with the word "eye" - http://www.ldoceonline.com/dictionary/eye_1

Answer

keep an eye out - means look for someone/something

keep an eye on - means to observe/be aware of what someone/something is doing

Answer

keep an eye open/out (for something) to watch carefully so that you will notice when someone or something appears: 
Keep an eye out for rabbits in the field. See here some expressions with the word "eye" - http://www.ldoceonline.com/dictionary/eye_1

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