Two-tone

A flop with two cards of one suit, so a flush draw is possible.

Example

K♥ 9♥ 4♣: someone may hold two hearts and a flush draw.

Also written: two tone, two-tone board.

Related

Practise it in 5 minutes

Quads is for adults, 18 and over. It teaches with play chips only: there is no real money, ever.