be in (one's) DNA

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be in (one's) DNA

To be a core aspect of one's character, motivation, or lineage; to be an intrinsic or fundamental part of one. He's always been that way, ever since he was a small boy. Helping others just seems to be in his DNA. This company has been drilling oil since my great-grandfather first struck crude oil back in 1902. It's in our DNA!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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