Meaning of “crash course” in the English Dictionary

british dictionary

"crash course" in American English

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crash coursenoun [ C ]

/ˈkræʃ ˌkɔrs, ˌkoʊrs/

a short period of instruction in which much is learned about a subject

A crash course is also an experience that is difficult or unexpected but provides new and useful information:

To prepare for his role in the movie, he took a crash course in doing farm chores like plowing fields and shearing sheep.

(Definition of “crash course” from the Cambridge Academic Content Dictionary © Cambridge University Press)