Resembling, relating to, or characteristic of a coach or coach-like in appearance or manner.
From 'coach' + '-y' (a suffix that turns nouns into adjectives meaning 'having the quality of'). This informal adjective emerged in the 20th century as a colloquial way to describe coach-related characteristics.
The word 'coachy' is a great example of how English speakers naturally add '-y' to almost any noun to create descriptive words—it's productive wordplay that happens in real conversation before dictionaries catch up.
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