To remove from a coach or carriage; to take out of a vehicle.
From dis- (meaning to remove) + coach (a carriage or vehicle). This is a rare historical word from when coaches were the primary form of transportation.
Discoach is a beautiful example of how English forms new verbs with dis-: if you could 'coach' someone somewhere (carry them in a coach), you could 'discoach' them by taking them out—it's logical but rarely used.
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