noun
a person who is inside or part of a group or organization
adjective
relating to or characteristic of someone who has special knowledge or access to information
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The company's insider knowledge of the industry gave them a competitive advantage.
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I heard from an insider that there might be layoffs coming soon.
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The insider info I got says the new product launch is going to be huge.
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He was considered an insider in the art world, with connections to all the major galleries.