euphemism
noun [ C or U ] language uk/ˈjuː.fə.mɪ.zəm/ us/ˈjuː.fə.mɪ.zəm/
委婉语，委婉说法
a word or phrase used to avoid saying an unpleasant or offensive word
"Senior citizen" is a euphemism for "old person". “年长公民”是“老年人”的委婉说法。
The article made so much use of euphemism that often its meaning was unclear. 这篇文章用了太多的委婉语，以至于意思常常不甚明了。