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English definition of “sideline”

sideline

verb [T]     /ˈsaɪd.laɪn/
If a sports player is sidelined they are prevented from playing or competing, and can only watch: Johnson has been sidelined through injury.Competing in sportCompeting and contending (non-sporting) to stop someone taking an active and important part in something: The minister was sidelined after he criticized party policy.Not paying attentionTreating as unimportantNeglecting and ignoring
(Definition of sideline verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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