crash course

noun
a brief, intensive course of instruction, as to prepare one quickly for a test.
Also called cram course.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Dictionary.com's 21st Century Lexicon
Main Entry:  crash course
Part of Speech:  n
Definition:  a fast, intensive training in or study of a subject, esp. on the basics; also called cram course
Example:  They took a crash course on French before the trip.
Dictionary.com's 21st Century Lexicon
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American Heritage
Idioms & Phrases

crash course

A short, intensive training course, as in Daisy planned to take a crash course in cooking before she got married. [Colloquial; mid-1900s]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
So veterans looking for a move into the commercial world often need a crash course in the basics.
We've been wanting to expand our horizons, though, and yesterday's session gave us a crash course in on-location flexibility.
Estimating big game weights: a crash course for the curious.
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