A lump or chunk, particularly of something like coal or earth; also spelled 'juds' in plural.
From Middle English, possibly related to 'jog' or dialectal terms for lumps and chunks. The word is primarily British dialectal and hasn't changed much in meaning since medieval times.
This is a truly regional word—you'd hear it in parts of Northern England and Scotland, but it's nearly disappeared from modern English. It's a perfect example of how local, practical words for everyday objects get lost when industrialization changes the work people do.
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