German phrase
Du darfst nicht gucken!
Meaning
Don't look!
When to use it
It tells someone not to look. It is a firm rule during hiding.
Example dialogue
Ich verstecke mich hinter dem Baum. Du darfst nicht gucken!
I'm hiding behind the tree. Don't look!
Okay, ich zähle weiter.
Okay, I'll keep counting.