Dictionary
pay' dirt"
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.See
end zone (def. 1).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.