A string raise is a form of betting in poker where a player raises the bet without announcing their intention to raise. Instead, they will make a call and then raise on the same action, usually after seeing the other players' reactions. This type of betting is usually used to disguise the strength of the player's hand and can give them an advantage in the game. String raises are considered to be unethical in some circles and may be illegal in some jurisdictions. Generally, this type of raise is against the rules and will lead to the player being disqualified from the game.