Meaning of “crud” in the English Dictionary

(Definition of “crud” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"crud" in American English

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crudnoun [ U ]

us /krʌd/ slang

any offensive substance:

You couldn’t see a thing with all the crud in the air.

(Definition of “crud” from the Cambridge Academic Content Dictionary © Cambridge University Press)