1. in a legal position in a sport, especially not offside
Usage: sports
2. supportive or cooperative
Usage: informal

1. in or into a legal position in a sport
Usage: sports

Examples

• The player was onside when the ball was kicked.
• She stayed onside throughout the play.
• The referee ruled that he was onside.
• We need to keep everyone onside for this project.
• The manager worked hard to get the team onside.
• He moved onside just before the pass was made.