tv. to make a bargain or agreement better or more attractive. : Okay, I'll sweeten the deal. I'll throw in a lighted mirror on the visor.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
Cite This Source
Example sentences
If it's cobalt pink rather than pale rose in color, it has been treated with a chemical bath of dye and extra sweetening agents.
Sound engineers use a process called sweetening to keep every second near the upper limit.