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in‧side3

1 in or facing the inner part of something :
the inside pages of the newspaper
the inside pocket of his jacket
the inside pages of the newspaper
the inside pocket of his jacket2 information that is available only to people who are part of a particular group or organization :
Police believe the robbers may have had inside information.
inside information/the inside story etc
SSO
Police believe the robbers may have had inside information.