mother lode

Language: en

Meaning: (geology)Alargeorrichveinofgoldor of anotherpreciousmineralfrom which other branches extend.1912,Jack London, “The Little Man”, inSmoke Bellew:Undeterred, reasoning from the coarseness of the gold that it had not traveled far, they had set out in search of themother lode.; (idiomatic,by extension)Anysourceof valuable or useful material.2000April 10, Dick Thompson, “The Feds Step Up the Pace”, inTime‎[1]:It is also letting them probe the genomes of other organisms for DNA that could turn out to be amother lodefor medicine.2014March 4, Landon Thomas Jr., “Emerging, but No Longer a Mother Lode of Profits”, inNew York Times‎[2]:Emerging, but No Longer aMother Lodeof Profits [title]

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