脏字；下流字，禁忌字眼，难听字眼；
1. 脏话,粗话：赞助性行动,积极措施/affirmative action | 脏话,粗话/dirty word | 葬礼时的鸣枪队/firing party
2. 不恰当的话：不平稳的着陆/Roman candle landing | 不恰当的话/dirty word | 不切实际的计划/airy plan;wild scheme
noun
1. a word that is considered to be unmentionable
e.g. `failure' is a dirty word to him
2. an offensive or indecent word or phrase