take (your) eye off the ball
keep (your) eye on the ball - to give your attention to what you are doing all the time.
If you're a manager, you can't afford to take your eye off the ball for one minute.
英语词组固定搭配大全包含18674条英汉双解词组，基本涵盖了全部常用英文词组、短语的翻译及用法，是英语学习的有利工具。