settle down

verb

1. To make or become quiet and calm after a period of disturbance or restlessness.

   “It took John a while to settle down after the phone call.”

   “In terms of passenger route mileage, the UK railway of early 1970 had settled down to close to the present level, although there was still some pruning to do.”

2. To establish a settled lifestyle for oneself, especially by marrying.
3. To grow comfortable and familiar with one's new accommodation or circumstances.

   “I have not yet settled down in my new apartment.”