dirty word
noun
1- an offensive or indecent word脏话; 下流话。
1.1
- figurative a thing regarded with dislike or disapproval〈喻〉讨嫌的东西; 不受欢迎的东西, 忌讳字眼：
VAT is a dirty word among small businesses.
对小企业来说, 增值税是不受欢迎的。