A rotter is a person who treats other people badly — selfish, unkind, not to be trusted.

A rotter rotter is a person是一種人，who treats other people badly對別人很不好 — selfish, unkind, not to be trusted自私、不友善、不能信任。

It is British, and it sounds a little old-fashioned or playful now, the sort of word you meet in older stories or when someone jokes in a posh voice. You might call a man a rotter if he lies, cheats, or takes what is not his and does not care. It is not a heavy swear word, but it is not polite either; it is a sharp, almost comic insult.

It is British這個詞是英式的，and it sounds a little old-fashioned or playful now現在聽起來有點老派或帶點玩笑意味，the sort of word you meet in older stories or when someone jokes in a posh voice是那種你會在老故事裡遇到，或有人裝腔作勢開玩笑時會用的詞。You might call a man a rotter如果一個男人說謊、騙人 if he lies, cheats，or takes what is not his and does not care或拿走不屬於他的東西又毫不在乎，你可能就會叫他rotter。It is not a heavy swear word它不是一句很重的髒話，but it is not polite either但也不算禮貌；it is a sharp, almost comic insult它是一種尖銳、近乎滑稽的侮辱。

Americans almost never say it. Underneath is the idea that the person is “rotten” inside. You will hear it more in British books and films than in everyday talk on the street.

Americans美國人 almost never say it幾乎不會這樣說。Underneath is the idea底下的想法是 that the person is "rotten" inside這個人骨子裡是「rotten」（腐爛的）。You will hear it more in British books and films你會更常在英國的書和電影裡聽到它，than in everyday talk on the street而不是在街上的日常對話裡。