Definition
Residing or living in someone's home.
住在某人家中
Since you are living under my roof, you must respect the rules of this house.
既然你住在我家，你必須尊重這個家的規矩。
He's an adult, but he still lives under his parents' roof.
他已經成年了，但仍然住在他父母的屋簷下。
During times of financial hardship, many adult children choose to return under their parents' roof.
在經濟困難時期，許多成年子女選擇回到父母的屋簷下。