Crash course

Meaning: a course that teaches you a lot of basic facts in a very short time, a short and intense training course in something

Example: I took a crash course in ballroom dancing so we wouldn't look stupid on the dance floor.

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Выучи грамотный разговорный английский до уверенного владения всего за 9 месяцев по системе естественного усвоения иностранных языков. Жми!