|
You can say: "katse ki arakse" (κάτσε κι άραξε). This is more slangish 
or
"katse (or kathise) kai halarose" (κάθισε (ή κατσε) και χαλάρωσε).
or (more literal translation)
"kathise kai ksekourasou" (κάθισε και ξεκουράσου). This is probably the one you're looking for  |