mother lode

Từ điển Việt Anh Việt 4in1 - English Vietnamese 4 in 1 Dictionary

ˈmother lode BrE AmE , moth‧er‧lode /ˈmʌðələʊd $ -ðərloʊd/ noun [countable usually singular] American English
1. a mine that is full of gold, silver etc
2. a place where you can find a lot of a particular type of object
mother lode of
The Sharper Image catalog is a mother lode of men’s gadgets and toys.
3. hit the mother lode informal to produce or find something that will make you very rich, happy, or successful:
They hit the mother lode with their second album.