A person who works in fields or does manual labor on farms; an archaic or dialectal term for a farmhand or agricultural worker.
From Old English and Germanic roots related to 'acre,' the unit of land measurement. The suffix '-er' denotes someone who works with or on something.
The word 'acre' itself came from how much land one person with a plow and oxen could work in a day—so an 'acker' was literally whoever worked those acres! This shows how Old English words were deeply practical, describing exactly what people actually did.
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