Etymology

insider

I1N1S1I1D2E1R1

Today it means: A person who has special knowledge about the inner workings of a group, organization, or institution. Full definition →

English inside ← Middle English ynneside
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The story

  1. Middle Englishynneside
  2. Englishinside
  3. English todayinsider

From inside + -er.

Etymology from Wiktionary, CC BY-SA 4.0.