Presumably borrowed from (or identical to) Akk. temmennu ‘foundation’ due to the parallelism with pnt in KTU 1.2 iv 17-18 (Kogan 2015:302) thus separated from tmnt, which in its turn may be a cognate of Hbr. təmūnā (Kogan 2015:342).
quite uncertain (cf. Pardee 1985: 66), as long as the meaning suggested by the authors of DUL is accepted, there is hardly any need to postulate a borrowing from Akk. tamšīlu (CAD T 147).
Any connection with the Akkadian verb târu ‘to turn’ must be considered highly uncertain, and an Akkadian loanword in Ugaritic, practically impossible (contra Watson 2007: 110) (Kogan 2015: 368).
Kogan 2015: 367: very uncertain (cf. Pardee 1988:178 and the references there), none of the Akkadian etymologies listed in Watson 2007: 111 is persuasive.