1590s, literally "to throw a card away," from dis- "away" + card (n.). Figurative use (in a non-gaming sense) is first recorded 1580s. In the card-playing sense, decard is attested [..]

to throw away.

anything that is cast aside or discarded throw or cast away; "Put away your worries" (cards) the act of throwing out a useless card or of failing to follow suit getting rid s [..]

v. To reject.

TCP IP port numbers 9/udp Discard                        

To officially withdraw an item from a library collection for disposal, a process that includes removing from the catalog all references to it. Also refers to any item withdrawn for disposal, usually s [..]

(n) anything that is cast aside or discarded(n) (cards) the act of throwing out a useless card or of failing to follow suit(n) getting rid something that is regarded as useless or undesirable(v) throw [..]

To throw out of one’s hands such cards as are useless.

(1) To play a card that is neither of the suit led nor of the trump suit, or (2) the card so played. Colloquialisms for discard include ditch, pitch and shake. Defenders can and do convey information [..]

After picking a card, to reduce the hand by placing one card on the top of the discard pile face up thus ending one's turn.

(1) (verb) play a plain-suit card of a suit other than the one led

– A tile that is thrown away and not chosen by another player.

 When a card is discarded, it is placed in the appropriate trash. Cards can be discarded from hand, from the deck, or from being revealed, but not from play.

Play a card to a trick that is from a different suit than the one led and is not a trump.

To put a card from the hand on the discard pile, ending one’s turn; a card so discarded.

To throw away a card of a different suit (when you can’t follow suit)

Taking a card from a player's hand and removing it from the game without it ever having an effect. This is often done if a player has too many cards in his or her hand, or due to effects from other cards. Disenchanting

Remove from the Game with no further effect. This includes Discarded.

To reject cards from the first five hand poker combination and draw new ones.

A button in the ShopKeep register app that cancels the current sale/return.