keep one's eye on the ball

[keep one's eye on the ball] {v. phr.} 1. To watch the ball at alltimes in a sport, usually in order to hit it or get it; not stopwatching the ball.

Keep your eye on the baseball or you won't beable to hit it.

2. {informal} To be watchful and ready; be wide-awakeand ready to win or succeed; be smart.

Tom is just starting on thejob but if he keeps his eye on the ball, he will be promoted.

Compare: ON THE BALL, KEEP AN EYE ON or KEEP ONE'S EYE ON or HAVEONE'S EYE ON.