What does lather mean?
Lather names the frothy bubbles that form when soap is worked with water, and by extension the foamy sweat that can collect on someone’s skin. The verb describes the formation of this foam, as when a person lathers soap between their hands before washing, or when a mixture is beaten until it becomes frothy. Lather is common in practical contexts such as shaving, shampooing, washing, and bathing, and it can also convey the physical impression of heavy sweat. Although the word can suggest abundant foam, its basic meaning is straightforward: it identifies the light, bubbly material produced by soap, water, or vigorous agitation. It is useful in descriptions of washing routines, sports, grooming, and cooking, where the presence or texture of foam helps explain what is happening.
Foam or froth formed when soap is rubbed with water; also, a frothy layer of sweat.
"The barber covered the client's face in warm lather before beginning the shave."
The sense involving sweat is often used in the phrase 'a lather of sweat.'
To form foam or froth, especially when soap is rubbed with water; to cover something with such foam.
"She lathered the shampoo into her hair until it began to build a thick foam."
The plural is uncommon because lather is normally used as an uncountable mass noun.
"The soap produced several small lathers as it was rubbed against the washcloth."
A good lather is more than foam: it is the sign that soap, water, and vigorous rubbing have become one useful cleaning machine.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does lather come from?
The word comes from Old English læþer, meaning foam or froth, and developed through Middle English into its modern form. It belongs to a Germanic word family that includes related forms in other Germanic languages, such as Dutch lader and German Lather. The modern spelling reflects the influence of Middle English dialect forms and the general development of English spelling.
Related word forms
How lather is actually used
In its usual senses, lather is neutral and descriptive. The phrase 'a lather of sweat' is somewhat figurative but remains conventional; 'lather' is also used in the context of grooming and handwashing, while the verb can describe the production of foam through rubbing or beating.
Easily confused with lather
Lather is foam or froth, whereas slather means to spread or smear a substance thickly over something.