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

 

mother lode

 noun
noun
BrE
 
; NAmE
 
[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