Free ShowDown Raise, in poker where you or a villain check-raise or even bet-3bet with a hand that you would like to see a showdown cheaply but can also improve on the river to a relatively-hidden better hand. Often it is used as a way of seeing the showdown for the same amount as just check-calling both the turn and the river, but against weak-tight players it might even win you the pot on the turn since many weak-tight players think "he's not 3-betting with worse than what I have, I fold".