"Settle into" is a phrasal verb that refers to the process of becoming comfortable or accustomed to a new environment. There are several synonyms for this phrase such as "acclimate to," "adapt to," "get used to," "accustom to," "adjust to," "familiarize with," or "habituate to." All of these phrases refer to the same process of transitioning oneself into a new environment and feeling comfortable in it. For example, when moving to a new city or country, one must be able to acclimate or adapt to the new lifestyle, weather, culture, and surroundings. Once one becomes familiarized with the new environment, they can then settle into it comfortably.