String Bet
A string bet is a bet or raise in which a player does not put all the chips in the pot in one motion, or does not say the amount first. Rooms forbid string bets because they can be used to see the other player's reaction.
The simple explanation
If you put some chips in, go back to your stack and add more, the bet is a string bet. In most live rooms, only the first amount counts. To avoid a problem, say 'raise' and the amount, or put all the chips in with one move.
A closer look
The rule is meant to stop a player from testing the reaction of an opponent before deciding on the full size of his bet. A related rule is forward motion, which commits a player who moves chips toward the pot. A call with one motion and a later raise is also a string bet. Rules vary, but most live rooms follow them, so it is wise to announce the raise.
A practical example
A player puts a $50 chip in the pot and then reaches back to add another $50. The dealer rules that it is a string bet, and only the $50 counts.
Full explanation
A string bet is a bet or raise in which a player does not put all the chips in the pot in one motion, or does not say the amount first. Rooms forbid string bets because they can be used to see the other player’s reaction.
A string bet is a bet put in with more than one motion.
It is not allowed in most live rooms.
The aim is to stop players from watching the reaction first.
Say the amount first or push all the chips in one move.
Alternative spelling: string-bet, stringbet