I doubt it: Meaning and Definition of

I" doubt' it"

Pronunciation: [key]
  1. a card game, the object of which is to rid oneself of all cards, in which the first player places aces face down on the table and the others follow, in turn, with cards of the next lower rank, adding at will other cards, except that if such deception is successfully challenged, the player must pick up all the cards then on the table.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.