Definition of photo finish noun from the Oxford Advanced Learner's Dictionary

 

photo finish

 noun
noun
BrE
 
; NAmE
 
[usually singular] Athletics, Equine sports
 
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the end of a race in which the leading runners or horses are so close together that only a photograph of them passing the finishing line can show which is the winner See related entries: Athletics, Equine sports
See the Oxford Advanced American Dictionary entry: photo finish