lather UK /ˈlɑː.ðə/US /ˈlæð.ɚ/noun 3verb 3forms 3phrases 1 noun3 •The foam made by rapidly stirring soap and water.Stately, plump Buck Mulligan came from the stairhead, bearing a bowl of lather on which a mirror and a razor lay crossed. — 1922 •Foam from profuse sweating, as of a horse. •A state of agitation. verb3 •To cover with lather.I lathered my body with lavender-scented soap. •To form lather or froth, as a horse does when profusely sweating.I woke Corporal Honda to see to the horse. Heavily lathered and breathing hard, it had obviously come a long way at high speed. — 1997 •To beat or whip. formslathered · lathering · lathers Phrases with lather lather upTo lather; to cover with suds