Action Only

In many card rooms, with respect to an all-in bet, only a full bet is considered a legitimate wager constituting a raise that can be reraised. In other words, anything less than a full bet is considered "action only," meaning other players can call such a bet but not raise it.

For example, Chloe bets $10 and Henry calls, then John goes all in for $14. When the bet gets back to Chloe, she is permitted only to call the extra $4, and the same goes for John.