shoo-in
Someone or something that is predicted to easily win a competition. Julia is a shoo-in for this year's spelling bee—she's the best speller in the whole town.
shoo-in
(ˈʃuɪn) n. an easy winner. My horse was a shoo-in. It won by a mile.
shoo-in
A sure winner. This term comes from horse racing. The verb “to shoo” has long meant to drive or urge on. In the early 1900s corrupt jockeys would select a long shot to beat the faster horses, which would then be “shooed in” by the others. Turned into a noun, the expression now is used for a team, a political candidate, or other competitor, without any connotation of malfeasance.