agricultural implement, heavy wooden rake, c. 1300, haru, probably from an unrecorded Old English *hearwa, apparently related to Old Norse harfr "harrow," and perhaps connected with harvest (n.). Or possibly from hergian (see harry (v.)).
"to drag a harrow over, break or tear with a harrow," c. 1300, from harrow (n.). In the figurative sense of "wound the feelings, distress greatly" it is first attested c. 1600 in Shakespeare. Related: Harrowed; harrowing.
<a href="https://www.etymonline.com/word/harrowing">Etymology of harrowing by etymonline</a>
Harper, D. (n.d.). Etymology of harrowing. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/harrowing