second nature noun

1. 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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[TahlilGaran] English Dictionary ▲

second nature
n. Something done without any special effort, as if by natural instinct.
Cutting tall trees has become second nature to the experienced lumberjack.

[TahlilGaran] English Idioms Dictionary ▲