be my guest
idiomPart ofguest
be my guest — idiom
1. a polite expression giving someone permission to do something they have asked to
1.idiom
Definition
a polite expression giving someone permission to do something they have asked to do, equivalent to 'please go ahead'
Example
"May I borrow your pen?" "Be my guest — I have another one."
When Mert asked if he could take the last piece of cake, Inês smiled and said, "Be my guest."