peel the onion(redirected from peel back the onion)
peel the onion
To expose the different various layers of something. Once the investigator started peeling the onion, he discovered just how many illegal operations the organization was involved in. You need to peel back the onion and find out what's really bothering Gina, because I doubt it's just the fact that you were late.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.