Definitions

1. noun

a thick, soapy foam, typically used for washing the body or hair

“She massaged the lather into her skin to clean it thoroughly.”

2. verb

to make something (such as the skin or hair) covered in a thick, soapy foam

“The soap lathered up quickly when he applied it to his face.”

3. verb

to make (a liquid) form a thick, soapy foam

“The detergent lathered the water in the sink.”