accustom
ac·cus·tom
/əˈkʌstəm/ verb , -toms, -tomed, -tom·ing [ + obj ]
: to cause (someone) to become adjusted to or familiar with something
— + to
trying to gradually accustom the students to their new surroundings
The time he spent in the army has accustomed him to rising early in the morning.
He'll have to accustom himself to life in a new country. [=he will have to become adjusted to life in a new country]