Definition of UNDERBELLY

a social sphere that exists outside of the mainstream <unable to get work in mainstream films, the actor ended up in Hollywood's underbelly—the porn industry>
Related Words abyss, depths
the side or part facing downward from something <the underbelly of the old submarine is in bad shape>
Antonyms face, top
a vulnerable point <the vast, thinly guarded southern border was obviously the underbelly of the nation's line of defense>

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