A four flush in poker is a hand consisting of four cards of a matching suit, offering the player a chance to make a flush on one of the later streets. It’s also commonly called a flush draw.
Four Flush Poker Example:
If you have a Th7h hand and the flop produces As Qh 6h, you have a four flush. In this case, you need just one more hearts-suited card on the turn or the river to make a flush.
