for all you, I, they, etc. know
idiomPart ofknow
for all you, I, they, etc. know — idiom
1. Used to emphasize that you do not know something and it does not matter to you.
1.idiom
Definition
Used to emphasize that you do not know something and it does not matter to you.
Example
For all I know, he could be living in Paris now.
She might have already left, for all we know.