Crud is a rough, informal word for stuff that is unpleasant to look at, smell, or taste — sticky dirt, old food in the sink, green mess on a bathroom wall, the nameless gunk on a tool. Americans use it more than British speakers.

Crud is a rough, informal word for stuffcrud是個粗俗、非正式的詞，指的是東西 that is unpleasant to look at, smell, or taste看起來、聞起來或嚐起來都讓人不舒服， sticky dirt, old food in the sink, green mess on a bathroom wall, the nameless gunk on a tool像是黏答答的髒污、水槽裡的過期食物、浴室牆上的綠色髒東西，或是工具上說不出名字的黏垢。 Americans use it more than British speakers美國人用這個詞比英國人多。

It can also mean junk that is worthless: “Get this crud off my desk.” It is not polite, but it is not the strongest bad word either; it is the sound of someone annoyed. You would not put it in a formal letter.

It can also mean junk that is worthless它也可以指沒有價值的垃圾東西： "Get this crud off my desk."「把這堆crud從我桌上拿走。」 It is not polite這個詞不算有禮貌， but it is not the strongest bad word either但也不是最重的髒話， it is the sound of someone annoyed聽起來就是有人在不耐煩。 You would not put it in a formal letter你不會把它寫進正式的信件裡。

Though actually, it is an old twin of the word curd, the thick part of sour milk. The meaning slid from “thick lumpy stuff” to “nasty lumpy stuff.” That is why it still feels messy in the mouth.

Though actually不過其實， it is an old twin of the word curd它跟curd這個字是很久以前的一對雙胞胎， the thick part of sour milkcurd指的是酸奶裡濃稠的那部分。 The meaning slid from "thick lumpy stuff" to "nasty lumpy stuff."意思從「濃稠成塊的東西」慢慢滑向「噁心成塊的東西」。 That is why it still feels messy in the mouth這也是為什麼這個字唸起來還是有種黏膩感。