Definition of because of preposition from the Oxford Advanced Learner's Dictionary

  

because of

 preposition
preposition
BrE BrE//bɪˈkɒz əv//
 
, BrE//bɪˈkʌz əv//
 
; NAmE NAmE//bɪˈkɔːz əv//
 
, NAmE//bɪˈkʌz əv//
 
 
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used before a noun or noun phrase to say that somebody/something is the reason for something They are here because of us. He walked slowly because of his bad leg. Because of his wife(’s) being there, I said nothing about it.