"All blue," I said, turning up my hole card with the other hand.
Two players called the bet and he flipped over his hole card—it was a seven-spot and again he won.
Camillo Bill studied the cards, tilted his hole card and glanced at its corner, and raised Brent two thousand.
At length the other turned down his cards in token of surrender, and with a laugh Brent turned his hole card face up.
He turned over his hole card which was a deuce, and again Brent laughed and flipped his hole card over.
He couldn't, at any time, actually read in the man's mind what his "hole card" was, he found.
noun phrase
A card dealt face down in stud poker (1908+ Poker)