Flat betting is the action of betting the same amount of money in every round, hand, or game. It’s called this because there are no fluctuations in pace or bet size, making the bets appear “flat.”
In a different context, flat betting can also be a specific betting strategy a gambler can employ to protect themselves against losing significant amounts of money in a single bet.
For example, a player might decide to flat bet until they get on a winning streak. When this happens, they gradually increase or decrease their bets until they connect a couple of losses again.