inside straight

noun
  1. Poker. a set of four cards, as the five, seven, eight, and nine, requiring one card of a denomination next above or below the second or third ranking cards of the set to make a straight.
Idioms
  1. draw to an inside straight, to build up hopes for something that has little or no chance of happening.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018