be at the bottom of
US /bi æt ðə ˈbɑtəm əv/
UK /bi æt ðə ˈbɑtəm əv/
1.
to be the real cause of something, especially something bad
:
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I suspect he's at the bottom of this whole mess.
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We need to find out who is at the bottom of these rumors.
to be the real cause of something, especially something bad