a candidate, competitor, etc., regarded as certain to win.
Americanism; noun use of verb phrase
a person or thing that is certain to win or succeed
a match or contest that is easy to win
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
My horse was a shoo-in. It won by a mile.]]>
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Dictionary of American Slang and Colloquial Expressions
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.