Var. tuḫm-. May be an early Aramaism (cf. Off. Arm. tḥ(w)m 'border, boundary; territory', Nab. tḥwm 'id.', Plm. tḥwm 'id.', JPA tḥūm 'border, limit, area', CPA tḥwm 'border, limit, boundary; territory, region, district', JBA tḥūmā 'border, limit', Syr. tḥumā 'limit, boundary, border; precept, regulation, penalty; definition, term', Mnd. tauma 'boundary, frontier, limit'), see the discussion under Akk. taḫūmu 'border, territory'.