The idiom "see something out of the corner of your eye" means to catch a glimpse of something without looking directly at it. It's like when you see something in your peripheral vision, which is the area around your visual field that you can see without turning your head or moving your eyes.
You can use this idiom when you want to describe a situation where you saw something quickly or briefly, but you didn't get a clear view of it. For example, you might say, "I thought I saw a mouse out of the corner of my eye, but when I turned to look, it was gone."
This idiom is often used to describe situations where you're not sure if you really saw something or if it was just your imagination. It can also be used to describe situations where you're trying to be discreet or not draw attention to yourself, like when you're trying to avoid eye contact with someone you don't want to talk to.
Overall, "see something out of the corner of your eye" is a useful idiom for describing situations where you catch a glimpse of something quickly and unexpectedly.
• I think I saw a mouse out of the corner of my eye, but when I turned to look, it was gone.
• As I was walking in the woods, I saw something out of the corner of my eye, but it turned out to be just a tree branch.
• As a detective, I have learned to pay attention to every detail, even if it's just something I see out of the corner of my eye.
• During the meeting, I noticed one of my colleagues looking at me out of the corner of their eye, and I wondered if I had said something wrong.
• While driving on the highway, I saw a car swerve out of the corner of my eye, and I knew I had to be careful.
• As I was reading my book, I saw something move out of the corner of my eye, but when I looked up, it was just my cat.