a rapid and intense course of training or research (usually undertaken in an emergency); "he took a crash course in Italian on his way to Italy"; "his first job was a crash course in survival and in learning how to get along with people"; "a crash programme is needed to create new jobs
A crash course in a particular subject is a short course in which you are taught basic facts or skills, for example before you start a new job. I did a 15-week crash course in typing. a course in which you learn a lot about a particular subject in a very short period of time crash course in