1
as in underworld
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
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2
as in underside
the side or part facing downward from something
the underbelly of the old submarine is in bad shape
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3
as in back
a vulnerable point
the vast, thinly guarded southern border was obviously the underbelly of the nation's line of defense
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Merriam-Webster unabridged
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