The number of people or amount of cargo that completely fills a coach or bus; the maximum capacity of a coach.
From 'coach' (a vehicle) plus '-ful' (the amount needed to fill), a standard English formation for measuring capacity.
A 'coachful' of tourists is now a recognized unit of travel—tour companies estimate income by how many coachfuls of visitors they'll get, showing how common coach travel remains for group tourism!
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