"Day ones" is a term used to describe the people who have been there for you from the beginning, such as childhood friends or family members. Other synonyms for this term could include "ride or dies", "loyal companions", "true blue friends", or "home team". These people are the ones who have stood by you through thick and thin, and have supported you no matter what. "Day ones" is a way to acknowledge and show appreciation for these special individuals, who have played a key role in shaping who you are today.