American Dictionary

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Definition sideline in American English

sideline verb

[transitive] verb
/ˈsaɪdˌlaɪn/
1

to cause a player in a sport or game to be unable to play

Example

Quarterback Dan Marino is sidelined with a bad knee injury.

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2

to prevent someone from being involved in something that they would normally expect to be involved in

Example

Some delegates complained of being sidelined.

Synonyms and related words
Definition sideline in American English