The amount of cargo or goods that can fit in and be carried by a truck; a very large quantity of something.
From 'truck' (a vehicle for hauling cargo) plus 'load' (cargo). The term emerged in the early 1900s as motor trucks became common transportation.
A 'truckload' became such a common phrase for 'a lot' that we say 'a truckload of apologies' or 'a truckload of problems'—basically, when something is heavy or abundant, we compare it to a truck's capacity.
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