• thryfallow, thrifallow

trifallow (third-person singular simple present trifallows, present participle trifallowing, simple past and past participle trifallowed)

1. (obsolete, rare) To plough (land) the third time before sowing.
   • 1707, J[ohn] Mortimer, The Whole Art of Husbandry; or, The Way of Managing and Improving of Land.[…], London: […] J[ohn] H[umphreys] for H[enry] Mortlock[…], and J[onathan] Robinson[…], →OCLC:

     You may yet trifallow, also lay on your compost or Soil , as well on your Barley Land as Wheat Land

• “trifallow”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.