{i} soapy foam; frothy foam formed by excessive sweating; nervous state, agitated condition (Slang)
the foam resulting from excessive sweating (as on a horse) a workman who puts up laths form a lather; "The shaving cream lathered" cover with soap; "lather your body when you shower
When a substance such as soap or washing powder lathers, it produces a white mass of bubbles because it has been mixed with water. The shampoo lathers and foams so much it's very hard to rinse it all out