Its as same as tit for tat.... that you believe if someone does something wrong, they should be punished by having the same thing done to them.
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.
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.
No.
Yes
Keep watch on.
jump a lots
It is just an idiom and has no history.
Yes: "Beauty is in the eye of the beholder."
Something that can happen really fast or in the "blink of an eye"
About 400 BC in England , a
This is not used as much as it once was, but people will know what you mean if you use it; it's not obsolete.
The idiom "eagle eye" refers to having an acute eyesight, or an intently watchful eye. It refers to the sharp eyesight of an eagle, which are known for seeing fish from hundreds of feet up.