American Dictionary

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Definition sideline in American English

sideline noun

[countable] noun
/ˈsaɪdˌlaɪn/
1

a job that you do in addition to your main job, in order to earn extra money

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2

either of the lines on the sides of a sports field that show where the edges of the field are

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2.1

the area at the edge of a sports field

Example

He was shouting instructions from the sidelines.

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3

a situation in which you watch something that is happening but are not involved in it or cannot influence it

Example

This is no time for sitting on the sidelines - our government must get involved.

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4

to prevent someone or something from getting involved

Example

Men and women at the moment are so preoccupied with everyday gruelling schedule of life that they have no regrets about keeping humanity and humane treatment on the sidelines.

Definition sideline in American English