From Longman Dictionary of Contemporary Englishshoo-inˈshoo-in noun [countable] especially American English informal WINsomeone who is expected to easily win a race, election etcshoo-in for He was far from a shoo-in for president.shoo-in to do something He looked like a shoo-in to win the Democratic nomination.
Examples from the Corpus
shoo-in• But he was far from a shoo-in for president.• But, once again, Clinton was no shoo-in. 