euphemism
US /ˈjuː.fə.mɪ.zəm/
UK /ˈjuː.fə.mɪ.zəm/
1.
a mild or indirect word or expression substituted for one considered to be too harsh or blunt when referring to something unpleasant or embarrassing.
:
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'Passed away' is a euphemism for 'died'.
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Using a euphemism can soften the impact of bad news.