To remain alert, to be focused on the task at hand.
Also, keep one’s eye on the ball.
en español# estar atento/a, no perder de vista el objetivo
| If you don’t keep your eye on the ball you will miss many business opportunities |
| I swear I was keeping my eye on the ball but I was so tired I couldn’t find those mistakes you are pointing out |
| The EU should keep her eye on the ball if she wants to bring eurosceptics back into the European dream |