It is basically a suspension element having a longitudinal member which pivots from the body at its forward end with a wheel hub being joined to its trailing end. A rigid trailing arm provides all the locations of a wheel.
A suspension component consisting of a longitudinal member that pivots from the body at its forward end and has a wheel hub attached at the other end (the trailing end). It is similar to a semi-trailing arm system except that its pivot axis is directly perpendicular to the vehicle's longitudinal axis.
A trailing-arm suspension is an automobile suspension design in which one or more arms (or "links") are connected between (and perpendicular to and forward of) the axle and the chassis. It is usually used on rear axles. A 'leading arm' as used on a Citroen 2CV, has an arm connected between (and perpendicular to, and to the rear of) the axle and the chassis.