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insider

insider /ɪnˈsaɪdɚ/ /ˈɪnˌsaɪdɚ/ noun
plural insiders
insider
/ɪnˈsaɪdɚ/ /ˈɪnˌsaɪdɚ/
noun
plural insiders
Britannica Dictionary definition of INSIDER
[count]
: a person who belongs to a group or organization and has special knowledge about it
opposite outsider