Two-Tone
A flop with two cards of one suit, so a flush draw is possible.
Learn the words of poker in five-minute lessons
Try Quads free
Example
K♥ 9♥ 4♣: someone may hold two hearts and a flush draw.
Also Written
two tonetwo-tone board
Related Words
Quads is for adults, 18 and over. It teaches with play chips only: there is no real money, ever.