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mother lode

or motherlode

[muhth -er-lohd] /ˈmʌð ərˌloʊd/
Mining. a rich or important lode.
a major or profitable source or supply:
New York City is a mother lode of actors.
Origin of mother lode
1855-60 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Examples from the Web for mother-lode
Historical Examples
  • His hopes of reaching the mother-lode of this mine vanished.

    Panther Eye Roy J. Snell
  • The day following his locating of the mother-lode, Pant worked feverishly.

    Panther Eye Roy J. Snell
  • Everybody in the cavern smiled, and I daresay if the truth were known we had discovered the mother-lode of comedy.

    Caves of Terror Talbot Mundy
British Dictionary definitions for mother-lode

mother lode

(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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