Idiom: On the Ball
alert and efficient
Examples
- She's really on the ball.
Key rules
- On the ball means alert, quick to understand and efficient
- It is informal and used with "be" or "stay"
- It describes a person's sharpness and competence
- It is often used as a compliment
Common mistakes
- She is in the ball → She is on the ball
💡 Tip: "Stay on the ball" means keep alert, which is a close use.