be at the bottom of
US /bi æt ðə ˈbɑtəm əv/
UK /bi æt ðə ˈbɑtəm əv/
1.
是...的根源, 是...的幕后黑手
to be the real cause of something, especially something bad
:
•
I suspect he's at the bottom of this whole mess.
我怀疑他就是这场混乱的幕后黑手。
•
We need to find out who is at the bottom of these rumors.
我们需要找出这些谣言的始作俑者。