Explanation of Rap
This isn't a specific phrase used in poker, but rather an expression from common English that can also be described using words like tap, hit, or knock.
In poker, rapping the table generally signifies a gentle double tap made by a player’s hand, expressing the desire to check. Traditionally, this tapping occurs on the table, but in contemporary play, a double tap of any surface is recognized as a request to check.
For instance, in a sentence -> The villain rapped on the table with his knuckles twice, signaling a check.
Incorporating Rap into Your Poker Tactics
It's beneficial to understand that a double tap equates to a check when you wish to indicate this without speaking. Additionally, players should be cautious about their hand movements during their turn to avoid giving the impression of a check if they actually intend to place a bet.