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Comprehensive
Dictionary Suite
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crud (slang) a coating of dirt, crust, caked filth, or the like. [1/4 definitions]
foul to make dirty or deposit filth in or on. [1/21 definitions]
mass noun a noun that denotes an abstract, uncountable entity and is not preceded by "a" or "an," such as "integrity," "filth," or "information".
muck dirt or filth, esp. if it is moist and sticky, or something that is considered be distasteful or dirty. [1/7 definitions]