Definition of but noun from the Oxford Advanced American Dictionary

 

but

 noun
noun
NAmE//bət//
 
, NAmE//bʌt//
 
NAmE//bʌt//
 
[usually plural]
 
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a reason that someone gives for not doing something or not agreeing “There are no buts about it,” he said firmly. “You are going.” With so many ifs and buts, we'll just have to wait and see.
See the Oxford Advanced Learner's Dictionary entry: but