Clauson (1972)
An etimological dictionary of pre-thirteenth-century Turkish
p. 191
D üŋüş-
Hap. leg.; Co-op. f. (in the sense of total action) of üŋ-. Türkü viii ff. (a falcon swooped on a hare, but just missed it; the falcon’s talons were skinned and) tavışğan teri:si: üŋü:şüpen yügü:rü: barmı:ş ‘the hare ran off with its skin thoroughly lacerated’ IrkB 44.