Clauson (1972)
An etimological dictionary of pre-thirteenth-century Turkish
p. 101
VU öği:-
‘to grind (grain Acc.); to pulverize (something)’. Survives only(?) in NE Alt., Tel. ökkö- R I 1181; Sag. ü:-/üğ- R I 1798, 1807; Tuv. öğe-: NC Kir. ük-; Kzx. üğ-. In some other languages replaced by öğit-, q.v. Considering the diversity of modern forms the initial may have been ü-, but ö- is likelier. Uyğ. viii ff. Civ. suğun müŋüzin yumşak öğüp ‘grinding down a maral deer’s horn finely’ H I 55: Xak. xi er buğda:y öği:di: ‘the man ground (ṭaḥana) the wheat (etc.)’ Kaş. III 254 (öği:r, öği:me:k): Çağ. xv ff. öğer (‘with -g-’) un öğüdür ‘he grinds flour’ Vel. 109 (in same sentence as 1 ö:g-; dubious, not in San.): Xwar. xiv (Fāṭima) tegirmen öğümekdin armış ‘was weary with turning the mill’ Nahc. 160, 16; 161, 1.