let go — to move or proceed, especially to or from something: They're going by bus.
center — a point equally distant from all points on the circumference of a circle or surface of a sphere
centre — A centre is a building where people have meetings, take part in a particular activity, or get help of some kind.
free — enjoying personal rights or liberty, as a person who is not in slavery: a land of free people.
loose — free or released from fastening or attachment: a loose end.
lose — to come to be without (something in one's possession or care), through accident, theft, etc., so that there is little or no prospect of recovery: I'm sure I've merely misplaced my hat, not lost it.