dǐ​pái

hole cards

底牌 dǐ​pái
hole cards noun
the cards held in a player's hand that are not visible to others in a game
hidden trump noun
undisclosed strength, resources, or information used as a final resort or strategic advantage

Frequency

Movie subtitles
1.01 per million appears in 0% of films
Written text
1.10 per million

Sources

Definitions
CC-CEDICT