insider

noun

USin-SY-dur/ɪnˈsaɪdɚ/UKin-SY-duh/ɪnˈsaɪdə/

2 meanings of insider

1
nouncountable
Someone who belongs to a group and knows secret or private details about how it works.
Like a player on the team who knows the plays, not a fan in the stands.
As a longtime insider, she knew which manager really made the decisions.
The reporter relied on insiders to learn what happened behind closed doors.
Similarsource
Oppositeoutsider
2
nouncountable
A person who is inside a closed or shut-in space.
Like someone shut inside a room after the door locks behind them.
The insider banged on the locked door, hoping someone outside would hear.
Rescuers worried about the insiders stuck behind the collapsed wall.
Similaroccupant
Oppositeoutsider

Practice

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Origin

It comes from the word "inside" plus "-er".