Make (oneself) at home polite phrase
To feel at ease as if a place were your home, or to tell someone to feel comfortable at a certain place, especially your home, as if it were their home.
Jeff and I have known each other for 10 years so he always makes himself at home when he visits me.
Do make yourself at home, Professor! What an honor to welcome you into my house!
I think you should stop making yourself at home at the boy's house, Hanna. It's not appropriate!
someone believe that they are allowed to do whatever they want in their own home
If you get your feet under the table, you get confidence in a new job or situation.
to be familiar with sb/sth; feel comfortable and relaxed; easy to talk/to work with.
People tend to remember the bad things others do and while they easily forget or get rid of others' good things.