Welche Bedeutung steckt hinter der hier vorgestellten Vokabel aus dem Bereich Meetings?

Emily: 'Ok, the website goes live on Monday, so I would like you to pay careful attention to any new content that is uploaded. This job will keep you on your toes, believe me.'

to keep someone on their toes

Do you know what it means?

• worried
• alert
• relaxed