Informal someone or something expected to win easily in an election, a race, etc.
Origin of shoo-inshoo + in
- A sure winner.
- One that has a sure chance of being chosen, as for a job or other position.
From a sense of the verb shoo, where racehorses would fall back and allow a chosen rider to win a fixed race. See 1910 quotation.
(plural shoo ins)
- Alternative form of shoo-in.