Problematic. Scarce attestation in the South Semitic area only; quality of the first radical unspecified.
Note a reduplicated stem and suffixed -m.
Probably, an Arabism (suffix -m).
Dissimilation from *sənam. An Arabism?
Hardle Cushitism (in view of the Sem. data), however, a borrowing from Arb. sanām- ‘camel hump’ is not impossible.
lit. “spine of back”. Isolated in MSA, probably an Arabism.