Meanings (ES + gloss)
manifestar • mostrar • revelar
To show plainly; to make to appear distinctly, usually to the mind; to put beyond question or doubt; to display; to exhibit.
And usually this manifests as them trying to prove their parent's criticism's and belittlings wrong.
His courage manifested itself through the look on his face.
manifestarse
To become manifest; to be revealed.
His osteoporosis first manifested as pain in his hips.