subnervo
From LSJ
subnervo: āvi, 1, v. a. sub-nervus, to cut the sinew beneath,
I to hamstring, hough (post-class.).
I Taurum, Tert. adv. Jud. 10 med.: equos, Vulg. Jos. 11, 6: jugales, id. 2 Reg. 8, 4.—*
II Trop., to invalidate, refute: calumnias, App. Mag. p. 327.