Trained or gave guidance to someone in a sport, skill, or subject, usually to help them improve or prepare for something.
From 'coach,' which originally meant a type of horse-drawn carriage, then a university tutor, then a sports instructor. The metaphor is of being transported toward improvement.
The word 'coach' comes from the town of Kocs in Hungary, famous for its carriages in the 16th century—so when we say someone 'coached' us in basketball, we're using a word that originally meant 'fancy Hungarian cart'!
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