do a Devon Loch

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do a Devon Loch

To achieve a sudden and unexpected failure or loss at the last minute, especially in sports. (Devon Loch was a horse poised to win the 1956 Grand National when he suddenly leapt and fell, ultimately losing the race.) They were up by three goals, but then they did a Devon Loch in the last few minutes of the match.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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