Trollop is an old insult for a woman, meaning she sleeps with many men. You need to know two things about it. First, it is offensive — it judges a woman for her sex life in a way that has no equal word for a man, and that unfairness is the whole point of the word. Second, it is old. It belongs to novels, to costume dramas, to a grandmother's angry voice. Because it sounds so dated, it now turns up more often as a joke than as a real attack: one friend says to another, in a silly voice, "come here, you trollop." That joking use only works between people who are close and who both hear the word as antique. Said seriously to a real woman, it is nasty. There is an older, slightly different shade you may meet in books: a woman who is untidy, dirty, careless about her house and her clothes — the two ideas, messy and immoral, sat together in the minds of the people who used this word. For your students, the practical advice is simple: know it when you read it, and do not use it.

（過時、貶抑）蕩婦、不檢點的女人；舊書裡有時也指邋遢的女人。屬於認得就好、自己別用的字。