*ṯ̣arb- - piece of wood (Kogan 2015:575)

The origin of Proto-MSA *ṯ̣arb- ‘piece of wood’ is unknown. It would be tempting to identify it with Gez. ṣaraba ‘to hew,’ ṣarb ‘plank,’ ṣərrāb ‘splinter, shaving’ and its cognates throughout EthS (CDG 563), but this comparison is difficult in view of reliable parallels with ṣ elsewhere in Semitic (notably, in Soq. ṣérob ‘couper,’ LS 357). (Kogan 2015:575)

*ṯ̣wy - to smell (Kogan 2015:575-576)

Possible cognates of Proto-MSA *ṯ̣wy ‘to smell’ are extensively discussed in SED I No. 286. From the semantic point of view, the closest parallels are Ugr. ṯ̣ˀu ‘exhalation, secretion’ (DUL 1007) and Gez. ṣiˀ ‘bad smell.’ Also remarkable are Hbr. ṣōˀā, ṣēˀā ‘excrement,’ ṣē(ˀ) ‘filth’ (HALOT 992) and Gez. ṣiˀat ‘rot, filth, stench, excrement’ (CDG 567). (Kogan 2015:575-576)

*ṭlf - to skim off (Kogan 2015:574)

The origin of Proto-MSA *ṭlf ‘to skim off’ is uncertain, although an ultimate connection with Gez. ṭalafa ‘to snatch away’ (CDG 590), Tna. ṭäläfä ‘to abduct; to seize, to grab’ (TED 2408), Amh. ṭälläfä ‘to abduct, to snatch’ (AED 2095), Har. ṭäläfä ‘to snatch away, to rob’ (EDH 153), Muh. Msq. Gog. Sod. ṭälläfä, End. ṭäläfä ‘to rope an animal to milk or to kill it; to make an opponent fall by intertwining one’s legs with his; to kidnap a girl to marry her; to snatch away’ (EDG 617) is not unlikely. (Kogan 2015:574)

*wḳf - to be silent (Kogan 2015:576)

As argued by M. Bittner (1911:81) and W. Leslau, Proto-MSA *wḳf ‘to be silent’ is likely related to Arb. wqf ‘to become still, to stop, to stand’. See further DRS 609. Any connection with Akk. ḳâpu ‘to buckle, to collapse’? (Kogan 2015:576)

*wzm - to give; to lend (Kogan 2015:576)

"Must be related to Arab. wzm 'to pay a debt; to join a small piece of something to what is similar to it" (LA 12 756), so sparsely attested that one may wonder whether it is autochtonous in Arabic. A borrowing from Arabic into MSA is, in this case, quite unlikely" (Kogan 2015:576)

*ydn - to be new (Kogan 2015: 33, ibid. 527)
*zhr - to go down (Kogan 2015:576)

The origin of Proto-MSA *zhr ‘to go down’ is unknown. (Kogan 2015:576)

*zlḳ - to draw (liquid) (Kogan 2015:576)

The origin of Proto-MSA *zlḳ ‘to draw (liquid)’ is unknown. (Kogan 2015:576)

*γyg - to give birth (animals) (Kogan 2015: 543)

see also *γayg- - man

Areal reconstruction
*ˀibil- - camel (SED II No. 2, Kogan 2011: 207)

one of the four widespread designations of camel in individual languages, the similarity between these designations must be due to diffusion from an Arabian source