English

Definition of cos conjunction from the Oxford Advanced Learner's Dictionary

 

cos1

 conjunction
(also ’cos, ’cause, coz) conjunction
BrE BrE//kəz//
 
, also BrE//kɒz//
 
; NAmE NAmE//kəz//
 
(British English, informal)
 
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because I can't see her at all, cos it's too dark.