the.com/insider
Someone close enough to the secrets to either profit or perjure.
means A person with access to private knowledge or influence within a group, company, or institution.
from From inside plus -er, surfacing in the 1800s for those literally indoors when others stood out in the cold of ignorance.
Legal weightInsider trading can mean prison, not just envy.
The thresholdDefined entirely by what outsiders cannot see.
Loaded prefixInside info sounds illicit; inside knowledge sounds wise.