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insider (C1)

noun

Pronunciation: /ɪnˈsaɪdər/

A person with special access to information or knowledge about an organization or group, often implying an advantage due to this privileged position.

As an insider, she knew exactly which stocks were about to rise.
The investigation relied heavily on testimony from an insider.
He was considered an insider in the fashion industry, always ahead of the trends.

insider trading (collocation): The illegal practice of trading stocks based on confidential information. — "The government is cracking down on insider trading."
insider threat (collocation): A security risk originating from within an organization. — "Cybersecurity measures must account for the insider threat."
insider job (collocation): A crime or act of sabotage carried out by a member of the organization. — "The police suspected it was an insider job because the security system was bypassed."

Words with a similar meaning to insider:

Words with the opposite meaning to insider: