out of the corner of your eye
idiomPart ofcorner
out of the corner of your eye — idiom
1. seeing something not by looking directly at it, but from the side of your field
1.idiom
Definition
seeing something not by looking directly at it, but from the side of your field of vision.
Example
Out of the corner of her eye, Dahlia saw a cat slip through the open gate.
I caught the movement out of the corner of my eye and turned around quickly.