The idiom "keep an eye out for" refers to watching for something or someone. An example of a sentence using the idiom would be: Jeff should be arriving soon, so keep an eye out for him.
Keep watch on.
It is just an idiom and has no history.
About 400 BC in England , a
The image is of you pointing an eye at something or someone. It means to watch carefully.
spying or looking someone all the time
An excellent expression. To keep an eye, or to keep an eye on things means to maintain a watchful eye. You monitor what is happening with an appropriate zeal to the occasion. Another idiom would be, to keep an eye peeled. It means you are watching and protecting something, or someone.
An idiom is a phrase or expression where the literal meaning is different from the intended meaning. It may not make sense if interpreted word by word. Examples include "raining cats and dogs" and "barking up the wrong tree."
No, the idiom is "turned a blind eye" as in "she turned a blind eye to his suffering." You don't change an idiom around or you lose the meaning.
That phrase must be an idiom, because I can't understand what it means."It's raining cats and dogs" is an idiom for "it's raining really hard.""I am learning about idioms in English class."Timmy was the apple of my eye".This sentence is an example of an idiom.
No.
"Watch your back" means "Look out for what might be behind you." "I'll watch your back" means "Don't worry about what might be behind you, I'll take care of that."
Keeping an eye on someone means you are watching them. You could be watching them for their own safety, or you may find them suspicious. Example: "I wanted to go shopping, but Mom has me busy keeping an eye on my 2-year-old brother instead." Example: "Even though it was Halloween, I decided to keep an eye on the shopper with the ski mask, just in case they were a real robber trying to blend in with the people in costume."