an old game played with five, or three, cards dealt to each player from a full pack. when five cards are used the highest card is the knave of clubs or (if so agreed upon) the knave of trumps; -- formerly called lanterloo.-a modification of the game of "all fours" in which the players replenish their hands after each round by drawing each a card from the pack.-to beat in the game of loo by winning every trick.