Definition of mirror image noun from the Oxford Advanced Learner's Dictionary

 

mirror image

 noun
noun
BrE
 
; NAmE
 
 
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an image of something that is like a reflection of it, either because it is exactly the same or because the right side of the original object appears on the left and the left side appears on the right Draw the hands as mirror images of each other. She was a mirror image of her twin.
See the Oxford Advanced American Dictionary entry: mirror image