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to be at the bottom of sth
01
to be the direct cause of something, particularly something unpleasant
What is the origin of the idiom "be at the bottom of something" and when to use it?
The idiom "be at the bottom of something" has its origin in the idea that the bottom often represents the foundation or root cause of a situation or issue. It is used to suggest that a particular person or thing is the underlying reason or origin of a problem, event, or action.