Definition of "Lather" :
noun: the foam resulting from excessive sweating (as on a horse)
noun: the froth produced by soaps or detergents
noun: a workman who puts up laths
noun: agitation resulting from active worry
verb: rub soap all over, usually with the purpose of cleaning
verb: exude sweat or lather
"This unfit horse lathers easily."
verb: form a lather
"The shaving cream lathered."
verb: beat severely with a whip or rod