In betting, "blockers" are used to prevent or minimize losses by strategically betting on outcomes that reduce risk or hedge against potential unfavorable results. This approach involves placing secondary bets that act as a safeguard, ensuring that even if the main bet fails, a smaller payout from the blocker bet will offset part of the loss. By carefully selecting these secondary bets, bettors can stabilize potential earnings and manage risk more effectively, particularly when outcomes are uncertain or volatile.