zhe2 < MC tsyet < OC *[tet] (*tjet) 'cut off, break off; decide'

Schuessler, p. 821:

• zhe2 shou3 WW 1982.12:44 Yi4 I cut off heads.
• zhe2 liu3 fan2 pu3 [correction for Schuessler's "tu2"] Shi 100,3 He breaks the willows at the fenced garden.
• wu2 zhe2 jian1 680 Xuan Don't (cut the seal-band:) break the seal on my lips.
• fei1 ning4 zhe2 yu4 Shu 47,20 It is not the specious who should decide criminal cases.
• duan3 zhe2 Shu 24,34 Premature death.

Jäschke, p. 145:

• 1. to cut, ... to cut asunder, ... to cut off, chop off, the hands; to cut down, to fell, trees; to cut out, the tongue ... to rend asunder, to break, a thread, a rope, chains, fetters. ...
  
• 2. ... to decide, ces bcad-do thus he decided Dzl.; khrims; or (Dzl.) zhal-che, to pass sentence or judgment; to judge, condemn, cf. also thag-gcod-pa. ...

Probably from pre-Tibetan *tyat, where -ya- corresponds regularly to Chinese *[e]. This is the transitive/active form; see below for the intransitive/active form.

she2 < MC dzyet < OC *[Htet] (*Htjet) 'be cut off'

[find the Chinese evidence for this reading]

Jäschke, p. 145:

• to be cut into pieces, to be cut off, to decay, ... to cease, end, stop, of diseases Glr., of life Lex.; to cease to flow or to blow, of water or wind; to die away, to become extinct, of a family, a generation; to be consumed, of provisions Pth. of bodily strength Thgy.; to be decided ...

This is the intransitive/passive form corresponding to transitive *[tet], in both Chinese and Tibetan; the Tibetan 'a-chung corresponds regularly to the Old Chinese voicing prefix *[H].