Explanation of Blank
Imagine a game of Hold’em where the board on the turn reads as follows.
It should be evident that there are a large number of straight-draws and flush-draws that players might complete after seeing the river card. Imagine the river comes as follows.
The river did not complete any possible draw. It’s hence extremely like that the river improved any of the players at the table in a significant way. We hence refer to the river card as being a blank.
Example of Blank used in a sentence -> (Hold’em) we had the flush draw on the turn but had to give up on the pot after the river came a complete blank.