Hungarian Historical Phonology szakad
szakad 'reißen, zerreißen, zerrissen werden'
szakít 'reißen, zerreißen, abreißen'
észak 'Nord'
éjszaka 'Nacht'
First attestation/Old Hungarian data
[coming]
Important dialectal forms
szak 'apró darab, rész, törmelék; kleines Stück, Teil, Schutt, Gebrösel'
Uralic/Ugric/Pre-Hungarian reconstruction
? PUg *sakkV
Disputed:
UEW: PUg/?PFU *śakkɜ (śukkɜ) 'piece, bit, part; Stück, Teil'
Status of the Ugric etymology
Plausible
Loan etymology
None suggested so far
Cognates suggested in earlier research
UEW:
Khanty: East (V) săkaγəl- 'Schaden leiden zerbrochen werden (der Mensch, der Hund, die Flinte, besonders durch Zauber, vor allem durch den 'bösen Blick'); aufplatzen (ein Pferd)', (Vj) săk: jöŋsăk 'Eisbrei (im Frühling vom Eis abgebröckelt)', South (DN) săχat- 'brechen, zerbrechen, in Stücke schlagen, zerkleinern (ein Gefäß, ein Boot, Glas, einen Napf, ein Schloß u. a.); zerbrechen, zerschellen (Eis)'
? Finnish: sukku 'zerquetschter Zustand'
Commentary
The possible Proto-Finno-Ugric etymology mentioned by the UEW has to be rejected, as Fi sukku cannot be regularly derived from the same source as Hungarian szak- and Khanty săkaγəl- etc. The Khanty words seem to reflect Proto-Khanty *i̮ (in Zhivlov's 2006 system). This vowel is not a regular reflex of PU *u, *o or *a (Zhivlov 2014: 124), but it can appear as the high ablaut grade of Proto-Khanty *a, which can reflect PU *a (Aikio 2013). Hungarian szak can reflect PU *a, so it seems possible to reconstruct a Proto-Ugric *sakkV.
There are no semantic problems in the connection of Hungarian szakad, szak etc. and the Khanty words refering to 'piece' and 'breaking'.
Conclusion
There are no phonological or semantic problems, and a Proto-Ugric word can be reconstructed.
References
MSzFE: 561-562, s.v. szak: PUg (? PFU)
UEW s.v. śakkɜ (śukkɜ): PUg (? PFU) Uralonet