Idioms and Phrases with on the inside
on the inside
In a position of confidence or influence, as in The new reporter said he got his facts from at least one official on the inside. [c. 1930]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.