make oneself at home

make (oneself) at home

To enter a particular place and make oneself comfortable, feeling free to behave as if one lived there. Often used as a polite imperative in the phrase "make yourself at home." Come in and make yourself at home! I'm just finishing up a few things in the kitchen. He really makes himself at home when he stays over, huh? Is that your sweater he's wearing?
See also: home, make
Farlex Dictionary of Idioms.

make oneself at home

to make oneself comfortable as if one were in one's own home. Please come in and make yourself at home. I'm glad you're here. During your visit, just make yourself at home.
See also: home, make
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

make oneself at home

Be at ease, act as though one were in one's own home. For example, I have to make a phone call but please make yourself at home, or Tim has a way of making himself at home just about anywhere. This expression was first recorded in 1860. Also see at home, def 3.
See also: home, make
The American Heritage® Dictionary of Idioms by Christine Ammer.
See also:
  • put (oneself) at (one's) ease
  • wash (one's) hands of (someone or something)
  • wash hands of
  • wash one's hands of
  • wash your hands of
  • wash your hands of somebody/something
  • wash your hands of something/someone
  • for (one's) (own) sake
  • for sake
  • keep in sight