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English definition of “sideline”

sideline

noun [C] (SPORT)    /ˈsaɪd.laɪn/ mainly US
a line that shows the position of the side of an area where a sport is played : The ball fell just inside/on/ outside the sideline.Surfaces on which sports take place
(Definition of sideline noun (SPORT) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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