something is a dirty wordBADif something is a dirty word, people believe it is a bad thing even if they do not know or think much about it 某个词是忌讳 SYN swear word ‘Liberal’ has somehow become a dirty word in America. “自由” 一词不知怎么的在美国变成了犯忌的字眼。
→ something is a dirty word at dirty1(1)