Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A pair of cards that are the only ones of their suit in a hand dealt to a player.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A set containing precisely two elements.
  • n. A pair of cards of the same suit, which are the only cards of that suit in a player's hand

from The Century Dictionary and Cyclopedia

  • n. In whist and bridge, a two-card suit.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. (bridge) a pair of playing cards that are the only cards in their suit in the hand dealt to a player

Etymologies

double + (single)ton.
(American Heritage® Dictionary of the English Language, Fourth Edition)
double +‎ -ton (Wiktionary)

Examples

  • The appearance of East's doubleton queen was a welcome sight, and all that remained was to resolve the position of the queen of clubs.

    The agonies of decision

  • That might be a singleton or it might be from queen-10 doubleton.

    Fourth time lucky

  • When instead he felled North's doubleton ace, he could not establish the spade suit and eventually finished two down.

    Netherlands win at home

  • If declarer believed that Sementa had chosen the unorthodox lead of a low card from a doubleton, he could now have made the contract easily because he had a tenace in diamonds – the eight would force West to cover with the nine, and declarer's six would beat West's three.

    Two unorthodox leads

  • Joe Grue successfully ran the jack of hearts, crossed to the ace of hearts, and led the king of spades in the hope of felling a doubleton jack in the South hand.

    Netherlands win at home

  • In case East has a doubleton honor or two honors, Cy should play dummy's ace at Trick One.

    Bridge

  • West signaled with the ten to show a doubleton, and East let dummy's king and queen win.

    Bridge

  • "By taking the ace and 'cashing' the king, she was showing a doubleton."

    Bridge

  • If the hearts had split 3-3 (or if a defender had held K-Q doubleton), South could have drawn trumps and led to the king of diamonds to take the good hearts.

    Bridge

  • There were two ways in which this might be achieved: South might have a doubleton, or he might have the singleton king.

    Tight finish in the English Premier League

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