Definitions

1. noun

a person who provides information, especially about the activities of a government, organization, or individual who is involved in illegal or clandestine activities

“The police were looking for an informer who had tipped off the smugglers.”

2. verb

to inform or give information about someone or something, often secretly or unofficially

“The spy had to informer the authorities about the planned attack.”

3. noun

a person who reports news or events, especially for a newspaper or magazine

“The journalist was a good informer and provided valuable insights into the story.”