The amount of material, passengers, or goods that can fit inside a cab, such as a taxi or truck cabin.
Formed from 'cab' (shortened from 'cabriolet,' a light carriage) plus '-ful,' an English suffix meaning 'the amount that fills.' The compound is a straightforward English construction.
The concept of measuring 'cabfuls' became important in the early 20th century with trucks and taxis—it was a practical way to describe capacity before standardized weight measurements were common.
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