knock yourself outINFORMAL
This page is about the conversational phrase knock yourself out
You can say this to give someone permission to have or do as much as they like.
- "Can I get myself something to eat?"
"Knock yourself out! There's plenty of stuff in the kitchen."
- "OK if we use your computer?"
"No problem. Knock yourselves out."
Also "go for it" (also informal)
Contributor: Matt Errey