second nature
noun/ˌsekənd ˈneɪtʃə(r)/
/ˌsekənd ˈneɪtʃər/
[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.
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second nature