stoolie

The detective promised to protect the stoolie who had given him the tip.

用法提示：stoolie 为名词，指给警方提供信息的线人。

After he was seen talking to the police, they called him a stoolie.

用法提示：stoolie 为名词，在句中作宾语补足语，指告密者。

She worked as a stoolie for the local police for two years.

用法提示：stoolie 为名词，与 work as 搭配，表示充当线人。