Definition of mother lode noun from the Oxford Advanced Learner's Dictionary


mother lode

BrE BrE//ˈmʌðə ləʊd//
; NAmE NAmE//ˈmʌðər loʊd//
[usually singular] (especially North American English)
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a very rich source of gold, silver, etc. in a mine (figurative) Her own experiences have provided her with a mother lode of material for her songs.
See the Oxford Advanced American Dictionary entry: mother lode