To unload cargo or to remove a burden or load from something.
From dis- (reversal, separation) + load (from Middle Low German and Old English lad, related to leading or carrying). The prefix dis- reverses the action of loading.
Disload is a nautical and commercial term that was common in shipping industries to describe the unloading of cargo—it's essentially the opposite of load, though 'unload' eventually became the more popular choice in modern English.
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