Flush DrawA flush draw is a draw consisting of 4 cards of the same sui, needing just one more of that suit to make a flush.
Example (Texas Hold'em):
flush draw is the draw to the best possible flush. It consists of the Ace in the flush suit. If the board is showing the ace, then the player needs the king in the flush suit to have the nut flush draw. If the board shows the ace and king, then he needs the queen, and so on.