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training
crash course (in something)
a short and intense training course in something. I took a crash course in ballroom dancing so we wouldn't look stupid on the dance floor.
keep in training
to maintain oneself in good physical condition. I try to keep in training so I will live longer. Try to keep in training.
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]