The crossword solutions for the term ACES, WHEN LOW are ONES. This term is used to describe a poker hand in which all four cards are of the same rank, such as four aces or four kings. This is the highest ranking hand in most poker games and is usually referred to as a 'four of a kind'. When the cards are of a lower rank, such as two twos or three threes, it is referred to as 'low aces' or 'low ONES'.