Insider
/ˌɪˈnsaɪdər/
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Definition
(noun) A person who has special knowledge about the inner workings of a group, organization, or institution.
Sentence Examples
The insider trading scandal put a lot of people out of business.
The politician tried to cover up the insider trading.
CEFR Practice Quiz
The journalist received a secret tip from a company ____ about the upcoming legal merger.