A yarn spinning technique which

(v.): An older method of machine spinning cotton into yarn with an emphasis on twisting, not just stretching the fibers; slower and more expensive, but produces stronger cotton.

Refers to the method of spinning that uses a Ring Spinning Frame where a roving yarn is drafted and twisted using a traveler to form a singles yarn. Ring Spinning is stronger than either air-jet spinning or open-end spinning and makes the highest quality sewing threads.