Definition of brain surgery noun from the Oxford Advanced Learner's Dictionary

 

brain surgery

 noun
noun
BrE
 
; NAmE
 
[uncountable]
 
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Idioms
it’s not brain surgery
 
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(informal) used to emphasize that something is easy to do or understand synonym rocket science Look, this isn't brain surgery we're doing here.
See the Oxford Advanced American Dictionary entry: brain surgery