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Related to soft soap: Hard soap
1. flattering talk; sweet talk. I don't mind a little soft soap. It won't affect what I decide, though. Don't waste my time with soft soap. I know you don't mean it.
2. (Usually soft-soap.) to attempt to convince someone (of something) by gentle persuasion. We couldn't soft-soap her into it. Don't try to soft-soap her. she's an old battle-ax.
Flattery, cajolery, as in She's only six but she's learned how to get her way with soft soap. This colloquial expression alludes to liquid soap, likening its slippery quality to insincere flattery. Its figurative use was first recorded in 1830.
soft soappersuasive flattery.
The underlying idea is of soft soap (literally a type of semi-fluid soap) being lubricative and unctuous.
1. n. flattering talk; sweet talk. I don’t mind a little soft soap. It won’t affect what I do, though.
2. tv. to attempt to convince someone (of something) by gentle persuasion. Don’t try to soft soap her. She’s an old battle-ax.