A bridge is a person who assists with power-leveling.

Usually, a pl team is eight-man. One 50, three 47's and 4 lowbies. The fifty runs through a mish on high difficulty, while the 47's sit at the entrance with their sidekicks. The mission is also commonly a Kill-badge farming expedition.

The bridges are the 47's, who allow the PL'ed toons to get the most experience for the mish. This term would also apply to the person 4 levels above the lowest in the party who exemps a higher-level toon for the mish.