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mother lode

noun
1.
Mining. a rich or important lode.
2.
a major or profitable source or supply:
New York City is a mother lode of actors.
Origin
1855-1860
1855-60
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for mother-lode

mother lode

noun
1.
(mining) the principal lode in a system
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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11
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