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second nature

noun [U]
 
 

Definition

If something is second nature to you, you are so familiar with it that you can do it easily without needing to think very much about it: I used to hate computers, but using them is second nature to me now.Adapting and attuning to somethingAdapting and modifying Changing
(Definition of second nature noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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