WordPress at a glance
function is not described

unregister_term_meta() WP 4.9.8

Unregisters a meta key for terms.

No Hooks.

Return

true/false. True on success, false if the meta key was not previously registered.

Usage

unregister_term_meta( $taxonomy, $meta_key );
$taxonomy(string) (required)
Taxonomy the meta key is currently registered for. Pass an empty string if the meta key is registered across all existing taxonomies.
$meta_key(string) (required)
The meta key to unregister.

Code of unregister term meta: wp-includes/taxonomy.php WP 5.2.1

<?php
function unregister_term_meta( $taxonomy, $meta_key ) {
	return unregister_meta_key( 'term', $meta_key, $taxonomy );
}