A “bluff catcher” is a term used in poker to describe a hand that can beat the bluffs in an opponent’s range but is not strong enough to beat their value hands. In other words, it is a hand that is strong enough to call a bet on the last round of betting, with the expectation that it can win against a bluff, but probably not against a genuinely strong hand.
For instance, if an opponent is aggressive and frequently bluffs, and you have a medium-strength hand (such as middle pair or bottom pair), this hand might act as a bluff catcher. You would call their bet, not because you believe you have the best hand, but because you believe they might be bluffing often enough for your call to be profitable.