second nature

A habit or mode of behavior so long practiced that it seems innate, as in Driving in heavy traffic is second nature to Chris. This expression is a shortened form of an ancient proverb, Custom (or usage) is a second nature, first recorded in 1390. It alludes to the fact that very frequently repeating something makes it seem completely natural or inborn.

Common Names:

Name	Pronounced	Usage
Murdoch	-	Irish
Raijin	ṙah-ee-jeen (Japanese)	Far Eastern Mythology
Nannie	['næni]
Guda	-	Arabic
Becky	['beki]
Lesedi	-	Southern African, Tswana