make oneself at home

make oneself at home (third-person singular simple present makes oneself at home, present participle making oneself at home, simple past and past participle made oneself at home)

1. (idiomatic) To make oneself comfortable as if one were in one's own home.
   • 2007, Jill Alison Ganon, ‎Sandy Gillis, At Home: Pasadena

     If you were lucky as a child, you were fêted in households other than your own, encouraged to relax, kick back and make yourself at home.