A second crop grown on the same land after the main harvest, or the yield from land after it has already produced once.
From 'after' plus 'crop' (from Old English cropp, originally meaning 'a sprout or bud'). Agricultural terminology dating to medieval farming practices when multiple harvests from one field were necessary.
Medieval farmers realized that if you carefully managed soil, you could squeeze out a bonus harvest—the aftercrop—which was especially valuable because it was unexpected profit.
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