Sideline | Mean of sideline in English Dictionary

/ˈsaɪdˌlaɪn/

• Noun
• a line that marks the outside edge of a sports field or court
• the space outside the area where a game is played on a field or court
1. We stood on the sidelines to watch the game.
2. He was forced to watch the game from the sidelines.
3. His injury has kept him on the sidelines [=has kept him from playing] this season.
4. He stayed on the sidelines and let his daughter run the family business her way.
• a job that is done in addition to your main job
1. She makes and sells jewelry as a sideline.
• Verb

• to prevent (a player) from playing in a game especially because of injury, illness, etc.
1. He was sidelined with a knee injury.
2. a lawyer sidelined by illness
3. Her career had been sidelined for several years by motherhood.