1. people who remain on the sidelines; observers who do not actively participate
Usage: plural form of sideliner

Examples

• The sideliners watched nervously as the debate grew more heated.
• During the crisis, many politicians became sideliners rather than taking action.
• The coach encouraged the sideliners to get more involved in practice.
• Some employees remained sideliners during the company restructuring.
• The sideliners offered plenty of criticism but no solutions.
• She refused to be one of the sideliners and volunteered to lead the project.