Live under the same roof phrasal verb
Used when you share a house with someone.
She was disappointed that she and her best friend would not be living under the same roof.
Although they quarrel, they still live under the same roof.
If they are going to live under the same roof, they need to improve their relationship.
To spend a great deal of time together
No one is able to do anything just by themselves.
If you find somewhere to hang up your hat, you find a place to reside.
To live alone as a bachelor
The verb "live" should be conjugated according to its tense.
Her boyfriend and she have lived under the roof since they graduated.
The origin of this expression is not clear.