Clauson (1972)
An etimological dictionary of pre-thirteenth-century Turkish
p. 629
kamşa:-
D kamşa:- Den. V. fr. kamış in the metaph. sense of ‘to move or sway’ like reeds in the wind; n.o.a.b. Türkü vm ff. IrkB 16, etc. (1 tur-): Uyğ. vm ff. Man.-A M III 9, 15 (ii) (çokra:-): Bud. TT X 164, etc. (tepre:-).