four flush • n. a poker hand of little value, having four cards of the same suit and one of another. Compare with flush3 .• v. (four-flush) [intr.] inf. (in poker) bluff when holding a weak hand, particularly a four flush. ∎ keep up a pretense; bluff: your mother will get wise that you're four-flushing.DERIVATIVES: four-flush·er n.