"machine that cuts, threshes and cleans grain" (short for combine harvester), 1857, from combine (v.).
early 15c., from Middle French combiner (14c.), from Late Latin combinare "to unite, yoke together," from Latin com "with, together" (see com-) + bini "two by two," adverb from bi- "twice" (from PIE root *dwo- "two"). Related: Combinative; combined; combining.
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