The term FLEX is used to describe a range of activities, from CONTRACT work to physical movement. A CONTRACT is an agreement between two or more parties, usually written and legally binding. An ANGLE is the space between two lines that meet at a point. A CURVE is a line that bends in a smooth arc. A CROOK is a BEND or CURVE in a line. A CORD is a length of rope or WIRE. A WIRE is a thin metal strand. A BEND is a curved or angled part of a line. All of these terms are related to the concept of flexibility, which can be applied to many different contexts.