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English definition of “sideline”

sideline

noun [C] uk   /ˈsaɪd.laɪn/ us  

sideline noun [C] (JOB)

an activity that you do as well as your main job: Jim works in a bank, but teaches French in the evenings as a sideline.

sideline noun [C] (SPORT)

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.

sideline

verb [T] uk   /ˈsaɪd.laɪn/ us  
If a sports player is sidelined they are prevented from playing or competing, and can only watch: Johnson has been sidelined through injury. to stop someone taking an active and important part in something: The minister was sidelined after he criticized party policy.
(Definition of sideline from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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