Comparative evidence

keu̯k, kʷeu̯k

• OInd. kuc-/kuñc- 'shrink', 'curl' (Whitney 1885: 19); 'sound high', 'utter a shrill cry' (as a bird); 'polish'; 'go'; 'connect', 'mix'; 'bend', 'make curved'; 'be curved', 'be crooked'; 'oppose', 'impede'; 'mark with lines', 'write', 'contract'; 'be small', 'make small' (MW: 287)

References

MW = Monier-Williams, M. 1899. A Sanskrit-English Dictionary. Clarendon Press.
Whitney 1885 = Whitney W. D. 1885. The roots, verb forms and primary derivatives of the Sanskrit language. A supplement to his Sanskrit grammar. Leipzig.