Clauson (1972)
An etimological dictionary of pre-thirteenth-century Turkish
p. 715
köl-
(g-) ‘to harness’ (an animal to a plough, etc.) and the like. Survives only(?) in NE Koib., Sag. R II 1268; Khak. See költür-, kölük, kölün-. Türkü viii ff. IrkB 25 (bokursı:): Kıp. xiv köl- (‘to laugh’ and) rahata qawā’ima’l-šāt li’l-dabḥ ‘to fasten the legs of a sheep for slaughter’ İd. 83.