1. A word or expression that some people use when they want to talk about something unpleasant or embarrassing without mentioning the thing; or an inoffensive expression that is substituted for one that is considered offensive.
2. A word or phrase that is more neutral, vague, or indirect to replace a direct, harsh, unpleasant, or offensive term.
3. Nice ways to say bad or vulgar things.

The use of a more acceptable or agreeable word or comment instead of one that is considered to be offensive or too blunt and harsh. (3)