wp_delete_nav_menu( int|string|WP_Term $menu )

function wp_delete_nav_menu( $menu ) {
	$menu = wp_get_nav_menu_object( $menu );
	if ( ! $menu )
		return false;

	$menu_objects = get_objects_in_term( $menu->term_id, 'nav_menu' );
	if ( ! empty( $menu_objects ) ) {
		foreach ( $menu_objects as $item ) {
			wp_delete_post( $item );
		}
	}

	$result = wp_delete_term( $menu->term_id, 'nav_menu' );

	// Remove this menu from any locations.
	$locations = get_nav_menu_locations();
	foreach ( $locations as $location => $menu_id ) {
		if ( $menu_id == $menu->term_id )
			$locations[ $location ] = 0;
	}
	set_theme_mod( 'nav_menu_locations', $locations );

	if ( $result && !is_wp_error($result) )

		/**
		 * Fires after a navigation menu has been successfully deleted.
		 *
		 * @since WP-3.0.0
		 *
		 * @param int $term_id ID of the deleted menu.
		 */
		do_action( 'wp_delete_nav_menu', $menu->term_id );

	return $result;
}