How to install Chosen using Drush Make?

Question

From Chosen module page:

This module comes with a Drush make file, which will automatically download the jQuery plugin if you use Drush make to set up your website.

I have Drush Make, but commands like..

 drush dl chosen
 drush en chosen

..don't help.
Should I use drush make ... command instead? Maybe there are other commands for quick libraries download.

P.S. I'm working on already installed copy of Drupal.