be at the bottom of
US /bi æt ðə ˈbɑtəm əv/
UK /bi æt ðə ˈbɑtəm əv/
1.
是...的根源, 是...的幕後黑手
to be the real cause of something, especially something bad
:
•
I suspect he's at the bottom of this whole mess.
我懷疑他就是這場混亂的幕後黑手。
•
We need to find out who is at the bottom of these rumors.
我們需要找出這些謠言的始作俑者。