n. & v.
--n.pl.
1. froth of soap and water.
2 US colloq. beer.
--v.
1. intr. form suds.
2 tr. lather, cover, or wash in soapy water.
Derivatives:
sudsy adj.
Etymology: orig. fen waters etc., of uncert. orig.: cf. MDu., MLG sudde, MDu. sudse marsh, bog, prob. rel. to SEETHE