Hungarian Historical Phonology titok
titok 'secret'
First attestation/Old Hungarian data
[coming]
Important dialectal forms
[coming]
Uralic/Ugric/Pre-Hungarian reconstruction
(Disputed:)
UEW: PUg *tajɜ-ttɜ- 'hide -> keep something secret; verbergen -> verheimlichen'
Status of the Ugric etymology
Probable
Loan etymology
Proto-Ugric ← Iranian *tāyā- 'secret; theft' (see Korenchy 1972 with references)
Cognates suggested in earlier research
UEW:
Mansi: South (TČ) tojtəwpākt- 'sich verbergen', (T) tujt- 'verbergen, verstecken, verheimlichen', (KM) tujt- 'verstecken', tujtpāχt- 'sich verstecken', West (P) tujt- 'verbergen, verstecken, verheimlichen', (LU) tujtkāt- 'sich verbergen', North (So) tūjt- 'verstecken', tūjtiγpāχt- 'sich verstecken' < Proto-Mansi *tūjt-
Commentary
The Ugric etymology of titok seems possible, but tolvaj, tulaj and tulajdon mentioned by UEW as possibly related cannot belong here. Regarding titok', it is interesting that Proto-Ugric/Proto-Uralic *oj yields Hungarian *ï in closed syllables (see the discussion in hízik) but there seem to be no good examples of *aj showing the same development, at least not in the initial syllable. The Mansi cognate points to and old *a_a stem. If we accept that Hu i < *ï < *aj(C) is regular, a Proto-Ugric (causative) stem *taj(a)-ttV- can be reconstructed like UEW .
It is unclear if tilos 'forbidden', also mentioned by the UEW, belongs here somehow.
The idea that Proto-Ugric *taja- is a loan from Iranian *tāyā- 'secret; theft' is plausible.
Conclusion
The Proto-Ugric etymology and its Iranian origin are plausible.
References
Holopainen 2019: Proto-Ugric ← Iranian
Korenchy 1972: Proto-Ugric ← Iranian
UEW s.v. *tajɜ-ttɜ--: Proto-Ugric Uralonet