The word "clarts" is pronounced /klɑːtz/ and refers to dirt or mud. It has an irregular spelling, with a "cl" sound followed by the sound of the letter "a", and then the sound of the letter "r". This is because the word likely originated from a northern dialect of British English. Despite being a lesser-known word, it is used frequently in some parts of the United Kingdom and has even made appearances in literature by authors such as Irvine Welsh.
The word "clarts" is believed to have originated in the North of England and Scotland, where it is used to describe thick, sticky mud or dirt.
The etymology of "clarts" is unclear and there are several theories regarding its origin. One possibility is that it is derived from the Middle English word "clart", meaning "to smear or spread with dirt". This word, in turn, may have come from the Old Norse word "kladda", which also means "to smear" or "to soil".
Another theory suggests that "clarts" may have developed from the Old English word "cleart", meaning "mud" or "clay". Over time, this word could have transformed into "clarts" through regional dialectal variations.