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1911 Encyclopedia Britannica
(a word of Scandinavian origin, from the Old Norwegian leggr, cf. Swed. lagg, Dan. lag; the O. Eng. word was sceanca, shank), the general name for those limbs in animals which support and move the body, and in man for the lower limbs of the body (see Anatomy, Superficial and Artistic; Skeleton, Appendicular; Muscular System). The word is in common use for many objects which resemble the leg in shape or function. As a slang term, "leg," a shortened form of "blackleg," has been in use since the end of the 18th century for a swindler, especially in connexion with racing or gambling. The term "blackleg" is now also applied by trade-unionists to a workman who, during a strike or lockout, continues working or is brought to take the place of the withdrawn workers.
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Chisholm, Hugh, General Editor. Entry for 'Leg'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/l/leg.html. 1910.