Settle down

[Oralee]

It means to get married or commit to a [monogamous] relationship; probably the two most indicative words for the situation itself, born of a word that can mean to move downward; sink, or [descend], to [subdue], and to conclude, and a word that means the opposite of up.

[Mary Mallozziberg]

to become familiar with a place and to feel happy and confident in it: