master card
/ˈmɑːstəkɑːd/ /ˈmastəkɑːd/noun
1 Bridge and Whist. A card that cannot be beaten unless it is trumped.
2A record card which summarizes the information recorded on a number of other cards.
3In form MasterCard. A trademark for: a brand of credit card.
- The brand was originally called Master Charge (q.v.)..
Origin
Late 19th century; earliest use found in Appletons' Journal. From master + card.