There are a variety of synonyms for the phrase "settle back," each with their unique connotations. "Relax" is one of the most commonly used terms, implying a sense of easing into a comfortable and carefree state. "Recline" is often used when referring to physically sitting back or finding a comfortable position, while "unwind" refers to a more mental and emotional release of tension. Other synonyms include "lounge," "nestle," "pacify," "compose," and "calm down." Regardless of the word chosen, the idea of settling back implies a sense of finding peace and comfort in the present moment.