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The end of a competition in which one participant comes from behind at the last minute to win. The phrase refers to US jockey Edward "Snapper" Garrison, who was known for securing such last-minute victories. That race sure had a Garrison finish—one of the runners came all the way from fifth place to win!
See also: finish
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.