stocking
 n.— «Stocking up is a term used to describe a harmless swelling of the leg from coronet to hock, usually in the hind legs. This swelling occurs naturally because of lack of movement by the horse while stalled. The normal walking around of a turned out horse causes the fluid known as lymph to circulate between in the tissues. However, during long periods of immobility the vessels carrying the lymph fluid become overloaded and appear as swelling in the leg.» —“Inactivity may lead to ‘stocking up’” in Betsy Carter Free Lance-Star (Fredericksburg, Virginia) Jan. 9, 2009. (source: Double-Tongued Dictionary)

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