Turning on verbose logging Is the "Verbose logging" in Drupal actually the PHP errors that can be activated in various ways (.htaccess, php.ini, settings.php) to be seen on screen?

Is it drush ws --full ?

From the material I've seen I can't say for sure if there is a unique definition for this concept in Drupal.

I would thank an experienced Drupal programmer to give the final word on this.
Navigate to admin/config/development/logging and set "All messages, with backtrace information".