Often good players will "defend" their blinds, especially if they're playing against an aggressive opponent who plays a lot of hands and bets heavily. Defending your blind means that sometimes you'll call a raise while you're in the big blind in order to slow down that opponent's aggression and show that you won't be scared away from your already-committed money. We don't suggest doing this often, because playing a weak hand out of position is very difficult. However, you might want to consider the option, especially if you're up against an opponent whose main strategy is bullying everyone out of the pot.