mother lode
or moth·er·lode
[ muhth-er-lohd ]
/ ˈmʌð ərˌloʊd /
noun
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
First recorded in 1855–60
Words nearby mother lode
Example sentences from the Web for mother lode
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 MundyHis hopes of reaching the mother-lode of this mine vanished.
Panther Eye |Roy J. SnellThe day following his locating of the mother-lode, Pant worked feverishly.
Panther Eye |Roy J. Snell
British Dictionary definitions for mother lode
mother lode
noun
mining
the principal lode in a system