The Collaborative International Dictionary
Trifallowing
Trifallow \Tri"fal`low\, v. t. [imp. & p. p. Trifallowed; p.
pr. & vb. n. Trifallowing.] [Pref. tri- + fallow. Cf.
Thryfallow.]
To plow the third time before sowing, as land.
--Mortimer.
Wiktionary
trifallowing
vb. (present participle of trifallow English)