Definitions

1. noun

A secondary or lesser consideration or activity, especially one that is not essential to the main purpose.

“The coach was worried about the team’s performance on the field, but the media attention was giving him a significant sideline.”

2. verb

To exclude or remove someone or something from a main activity or consideration.

“The new policy will sideline the old manufacturing process in favor of more sustainable methods.”

3. noun

The area alongside a sports field or other outdoor area, especially one where spectators sit or stand.

“The spectators on the sideline cheered as the team scored a touchdown.”