Dirty, unpleasant, or disgusting substance; also used as a mild swear word meaning something bad or annoying.
From Middle English 'crudde' (curdled milk), possibly from Old English roots. Originally meant any curdled or congealed substance; evolved to mean any disgusting gunk or filth.
The word 'crud' is what people say when they want to swear but can't—it's a censored stand-in for worse words. It's so well-understood as a replacement that audiences immediately know it's a curse word, defeating its own purpose!
Complete word intelligence in one call. Free tier — 50 lookups/day.