wrest แปลว่า

"[W]hen giving ley or stubble land a single furrow for a corn crop, the sock should never be so broad as the slice, but an inch or two within it; except, like the bent-sock it comes a good way back on the wrest: because this breadth of feather materially augments the draught; and, by cutting the slice clean out, before being embraced by the wrest, frequently causes it to be shot aside, in place of being turned over."

"They [turn-wrest ploughs] are now so constructed that the ploughman can readily shift his coulter by means of a lever, which reaches the bottom of the handles, and also his wrests or mould-boards from side to side, without leaving his station between the handles of his plough, they being so arranged that by withdrawing a small pin and pressing the projecting wrest towards the body of the plough, the mould-boards on either side become alternately the land side when not in work."

"The wedge is simply two inclined planes put base to base, and the same reasoning is true of it—that is, the thinner the wedge or more gradual the slope, the more easily it is driven. Applying this to the plough, we find that the coulter, share, wrest, cheek-plates, and sole-shoe, all form more or less continuous parts of a large wedge or moving inclined plane."