local. [f. THOROUGH sb.] trans. To make ‘thoroughs’ or furrows in; see THOROUGH sb. 3. Hence Thoroughed ppl. a.; Thoroughing vbl. sb.
1733. W. Ellis, Chiltern & Vale Farm., 28. Plough them in very shallow,… thorough and harrow well. Ibid., 106. The Ground may be so gathered into a four Thorough’d-stitch or Ridge. Ibid. (1744–50), Mod. Husbandm., V. I. 87. The land … should be back-bouted, or what we call thoroughed-down. Ibid. (1759), Pract. Farmer (ed. 5), Gloss. 5. Four-thoroughing of Land is not Clean Ploughing, but running up four Thoroughs close together with the Plough. Ibid. Thoroughing down is drawing the plough once through the bought, to lay it plain for wheat or barley.
