Meaning

noun the froth produced by soaps or detergents

noun agitation resulting from active worry

noun a workman who puts up laths

originFrom Middle English lather, from Old English lēaþor (“a kind of nitre used for soap, soda”), from Proto-West Germanic *lauþr, from Proto-Germanic *lauþrą (“that which is used for washing, soap”), from Proto-Indo-European *lówh₃trom (“that which is used for washing”), from *lewh₃-, *lowh₃- (“to wash, bathe”). Cognate with Swedish lödder (“lather, foam, froth, soap”), Icelandic löður (“foam, froth,…

Etymology from Wiktionary, CC BY-SA 3.0