O.E. plog, ploh "plow, plowland (a measure of land)," possibly from Scand. (cf. O.N. plogr "plow"), from P.Gmc. *plogo- (cf. O.Fris. ploch, M.L.G. ploch, M.Du. ploech, O.H.G. pfluog). O.C.S. plugu, Lith. plugas "plow" are Germanic loan-words, as is probably L. plovus, plovum "plow," a word said by Pliny to be of Rhaetian origin. Replaced O.E. sulh, cognate with L. sulcus "furrow." As a name for the Big Dipper, it is recorded from 1513. The verb is first recorded c.1420. Plowshare is first recorded c.1380.
To do the sex act with or to a woman; screw(1606+ and probably before)
The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D. Copyright (C) 2007 by HarperCollins Publishers. Cite This Source
Idioms and Phrases with plow under
Cause to vanish, overwhelm, as in The independent bookstores are being plowed under by the large chains. This term alludes to the farmer's burying vegetation by turning it into the soil with a plow.
[ Second half of 1900s