Free Card
A free card refers to seeing the turn or river card without having to make/call a bet.
Example: Suppose you have a T9 of spades, and you are on the button. The flop is AK4; the ace and king are of spades. It is checked to you, and you check as well. The turn comes. The turn card is a free card; you did not have to call a bet to see if you would complete your flush draw on the turn.
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