Definition of runner-up noun from the Oxford Advanced American Dictionary

 

runner-up

 noun
noun
 
(pl. runners-up)
 
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a person or team that finishes second in a race or competition; a person or team that has not finished first but that wins a prize Winner: Kay Hall. Runner-up: Chris Platts. The runners-up will all receive a $100 prize.
See the Oxford Advanced Learner's Dictionary entry: runner-up