When someone "settles down," it means that they have found a place to stay, a job to work, and a partner to share a life with, all with the intention of establishing a permanent home base. Synonyms for "settles down" include "plants roots," "puts down roots," "puts down stakes," and "lays down roots." These terms suggest a sense of permanence and stability, indicating that someone is committing to a particular place, person, or lifestyle for the long haul. Other similar phrases include "establishes oneself," "lays down a foundation," "finds a home," and "chooses a stable path." Whatever the wording, the idea is the same: someone is taking steps to create a life that feels secure and rooted in one place.