告密者检举他人的人；告密的人 One who informs against others; an informer.
告密者说了她很多坏话。 The informer has done dirt to her.
土匪头目决定把告密者开车带走杀掉。 The gang leader decided that the informer must be taken for a ride.
警察急忙赶到告密者提供的地址处，只获悉他们要捉的人一小时不到前已逃走了。 Police hurried to the address supplied by their informant, only to learn that their bird had flown less than an hour before.
