pay-dirt

pay dirt

noun
1.
soil, gravel, or ore that can be mined profitably.
2.
Informal. any source of success or wealth; a fortunate discovery or profitable venture: After months of experimentation, the scientists finally hit pay dirt.
3.
Football. end zone ( def 1 ).

Origin:
1855–60, Americanism

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pay dirt
 
n
1.  a deposit rich enough in minerals to be worth mining
2.  informal strike pay dirt, hit pay dirt to achieve one's objective

Collins English Dictionary - Complete & Unabridged 10th Edition
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