pay dirt
pay dirt {n.}, {slang}
1. The dirt in which much gold is found.
The man searched for gold many years before he found pay dirt.
2. {informal}
A valuable discovery. — Often used in the phrase "strike pay dirt".
When Bill joined the team, the coach struck pay dirt.
Jean looked in many books for facts about her hometown, and finally she struck pay dirt.
Compare: STRIKE IT RICH.
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Source: A Dictionary of American Idioms
