ts¹mʾn may be either the name of the building (formed on a verb s¹mʾ, related to Arabic s¹mʾ "to be elevate, high", which suits with high construction), or a form of the verb s¹my. In the first case, ḏ-thwn is a verb from the root hwn (in Mehri, hawīn "crumbling"). In the second case, Thwn is the name of the building.
1 [… ...] ʾw[.]ḍ and his sons [… …]
2 [… ...] of the family Mṯwʾm, they rised up [… ...]
3 [… ...] the house Ts¹mʾn which was in bad shape (?) [… ...]
4 [… ...] and beneath [… …]
5 [… …] and they built and laid the foundations of all […]
6 [… …] completed [… ...]
Höfner, Maria 1981. Sabäische Inschriften. (Letzte Folge). Sammlung Eduard Glaser. 14. (Sitzungsberichte der Österreichische Akademie der Wissenschaften. Philosophisch-historische Klasse, 378). Vienna: Verlag der Österreichischen Akademie der Wissenschaften.