Move in with Definition 1 of 2Pro Tip 1/3Romantic Step Used when a couple becomes serious and decides to live together. They're finally moving in with each other next month. Pro Tip 2/3Commitment Level Signifies a new level of commitment in a relationship, not just convenience. Moving in with her isn't just about saving rent, it's a big step. Pro Tip 3/3Joint Responsibility Implies sharing responsibilities like bills, chores, and the household. When I move in with my partner, we'll split all the housework.