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horses for courses
The phrase stems from the fact that a racehorse performs best on a racecourse specifically suited to it.
- (idiomatic) A person suited for one job may not be suited for another job, regardless of their expertise in the former job.
- (idiomatic) The practice of choosing the best person for a particular job.
The chiasmus "courses for horses" is less used.
The term is widely used in the foreign-language translation industry, where a translator is selected for a job not only according to their fluency in the language pairs, but also by their intimate knowledge of the subject matter.
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