Definition of second nature noun from the Oxford Advanced Learner's Dictionary

 

second nature

 noun
noun
BrE
 
; NAmE
 
 
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[uncountable] second nature (to somebody) (to do something) something that you do very easily and naturally, because it is part of your character or you have done it so many times He found that teaching was second nature to him.
See the Oxford Advanced American Dictionary entry: second nature