Definition: A "crash course" is a noun that refers to a quick and intense training or learning program. It is usually designed to teach someone a lot of information in a short period, often because they need to learn quickly for a specific reason.
You can use "crash course" when talking about learning something new in a short amount of time. It often implies that the learning is urgent or necessary.
In more advanced contexts, "crash course" can be used metaphorically to describe any rapid learning experience, not just formal education.
While "crash course" typically refers to a rapid learning experience, "crash" can also refer to an accident, especially involving vehicles or computers (e.g., "The car crashed into a tree," or "My computer crashed while I was working on my project.").
A "crash course" is a quick and focused way to learn something important. You might take a crash course when preparing for a trip, starting a new job, or needing to gain knowledge rapidly for any reason.