Footloose and Fancy-free

English has many idioms to express close connections. If two people are extremely close and do everything together, we say they are joined at the hip. If two people are very similar to each other, we say they are two peas in a pod. And when two people marry, we say they tied the knot.

Source : https://learningenglish.voanews.com/a/footloose-and-fancy-free/6942202.html