advise (one) against (something)
To make a recommendation to one to not pursue a particular plan or action. She advised him against taking out another mortgage on the house. The professor advised his students against skipping class if they wanted a passing grade at the end of the semester.
advise against something
to suggest that something not be done. Lisa always advises against hasty actions.
advise someone against doing something
to encourage or counsel someone not to do something. I advised Bill against quitting his job.