soft' soap'1. Informal.
persuasive talk; flattery: to use soft soap to get one's way.
the semifluid soap produced when potassium hydroxide is used in the saponification of a fat or an oil.
soft-soapPronunciation: (sôft'sōp', soft'-), [key]
to cajole; flatter.
to apply soft soap to.
to use soft soap in washing.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.