He always carries a side arm for self-defense.

I started a side hustle to earn extra money.

He was side-lined from the team after his injury.

The manager is side-lining the underperforming employees.

She is side lining her responsibilities at work.

The side-lines of the soccer field were filled with cheering fans.

The coach side-lines the player for his poor performance.

The side lines of the soccer field were clearly marked.

The referee side lines the player for a foul.

He was standing on the side line, cheering for his favorite team.