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general::
Phrase(s): out of the corner of one’s eye
Fig. [seeing something] at a glance; glimpsing something, as with peripheral vision. • I saw someone do it out of the corner of my eye. It might have been Jane who did it. • I only saw the accident out of the corner of my eye. I don’t know who is at fault.
McGrawhill's American Idioms And Phrasal Verbs