Comparative evidence

ḱu̯es

• OInd. śvas-/śuṣ- 'blow' (Whitney 1885: 181); 'hiss', 'pant', 'snort'; 'breathe', 'respire', 'draw breath' (also = 'live'); 'sigh', 'groan'; 'strike', 'kill' (MW: 1105)

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.