A vein of valuable ore or mineral that runs through rock underground; a rich source or supply of something useful.
From Old English 'lad,' meaning a course or way. It originally meant 'a path through the earth,' which evolved into a mining term for a mineral-bearing path or vein.
A 'lode' of gold is a literal vein in the earth, but the phrase 'hitting the lode' or 'mother lode' became how people talked about finding treasure—now it means any huge lucky discovery, from a thrift store goldmine to perfect song lyrics.
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