In a manner related to hand use or manual operation, often used in compounds like 'single-handedly' or 'two-handedly.'
From 'handed' (related to hand use) combined with the adverbial suffix '-ly.' The suffix converts adjectives and participles into adverbs describing manner.
The phrase 'single-handedly' became popular around the 1600s and literally meant doing something with only one hand, but evolved to mean accomplishing something against all odds with minimal help.
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