(idiom) to act as an accomplice to a villain; to abet an evildoer. From a legend where a person killed by a tiger becomes a ghost who helps the tiger find more victims.

Legendary ghost of a person eaten by a tiger, who acts as the tiger's servant and guides it to catch more victims.

(literary) bewildered; confused; describes a state of aimlessly wandering or not knowing what to do

In folklore, the ghost of a person devoured by a tiger who then helps the tiger find and kill other people; often used in the idiom [[为虎作伥|為虎作倀|wei4 hu3 zuo4 chang1]].