Mehri

ḏ̣ār - on, over (ML 86)

Proto-MSA
*ṯ̣a(h)r - on, over (Kogan 2015:575)

The original anatomical meaning is completely lost throughout this group. Semantically similar prepositional use of reflexes of *ṯ̣a(h)r- is admittedly attested in a few other Semitic languages (SED I No. 284). (Kogan 2015:575)