How can I display my meta value in a textarea? [closed]

The value of the textarea must be printed between the opening and the closing tag:

<form action="https://wordpress.stackexchange.com/">
    <textarea name="whatever"><?php echo esc_textarea( $description ); ?></textarea>
</form>

Note the usage of the function esc_textarea() here. It prevents any possible character inside the variable $description from being interpreted as HTML. It’s an important step to avoid possibly XSS vulnerabilities.

There are many more escaping functions like esc_attr(), esc_html() or esc_url(). You should know about them and how they are meant to be used: https://codex.wordpress.org/Data_Validation

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