substantiate

To make a word more based. It's like winning an argument by citing a link which proves you're so cool. To substantiate is to make something more authentic.

This story is substantiated by the official manuscripts of the government

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Atavism

The reappearance of a trait which first appeared in your ancestors - probably apes.

Drake : look a deer!

Dora : that looks tasty.
Drake : holy moly! that's some weird atavism you've got there.