Suit Definition & Meaning

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Cards.

one of the four sets or classes (spades, hearts, diamonds, and clubs) into which a common deck of playing cards is divided.
the aggregate of cards belonging to one of these sets held in a player's hand at one time.

Spades were his long suit.
one of various sets or classes into which less common decks of cards are divided, as lances, hammers, etc., found in certain decks formerly used or used in fortune telling.