noun
- a person who watches or observes from the sidelines rather than participating actively
Usage: informal
Examples
- He was always a sideliner at school events, preferring to watch rather than join in.
- The coach criticized the sideliners who offered advice but never volunteered to help.
- She refused to be a sideliner in the debate about school policy.
- Too many sideliners complained about the team's performance without understanding the challenges.
- The meeting was full of sideliners who had opinions but no real involvement in the project.
- Don't be a sideliner when your community needs volunteers.