to  be  at the bottom of  something
be
æt
āt
at
ðə
dhē
the
bɒtəm
botēm
bottom
əv
ēv
of
something

英語での「 be at the bottom of something 」の定義と意味

to be at the bottom of something
01

to be the direct cause of something, particularly something unpleasant 

慣用句
くだけた
The detective believed that a personal grudge was at the bottom of the crime. 
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