The action of loading cargo, passengers, or goods onto a boat; the process of filling a boat with freight.
Compound gerund from 'boat' plus 'loading' (from 'load'). A modern compound noun following the pattern of 'loading' combined with a specific context (boats rather than general loading).
Compound gerunds like 'boatloading' show how English dynamically combines elements to name new processes. Before cargo ships, 'boatloading' was a concrete daily activity—now it's mostly historical, but the word structure allows us to describe any era's labor.
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