collar

A collar is a band, usually worn around the neck, that marks one end of a garment or serves a practical function. The term derives from Old French col, from Latin collum meaning neck.

In clothing, collars frame the face and help define style. Garment collars vary widely, from turn-down and button-down to stand, mandarin, or boat shapes. They may be sewn into the garment or detachable, and can employ stiffness or shaping to maintain their form.

In human anatomy, the collarbone, or clavicle, is a slender bone that runs horizontally between the sternum and shoulder blade. It helps support the shoulder and protect underlying vessels and nerves. Fractures commonly occur in falls, sports injuries, or direct blows and may require immobilization or surgical treatment.

Collars are also used on animals, especially dogs and cats, to hold identification tags or attach a leash. Materials include leather, nylon, and fabric. Safety collars such as breakaway or quick-release designs reduce the risk of strangulation, particularly for cats or active pets; some collars incorporate microchips for identification.

Colloquially, to collar someone means to arrest or capture them. In manufacturing and engineering, a collar is a cylindrical ring fitted around a shaft or pipe to locate parts, constrain movement, or transfer torque. Common varieties include set-screw collars, clamp collars, and threaded collars, each serving specific mechanical purposes.