Comparative evidence

1.h₂u̯es, 1.h₂eu̯s, 1.h₁eu̯s

• OInd. vas-/uṣ-/uch- 'shine' (Whitney 1885: 155); 'grow bright' (applied to the dawn); 'bestow' (by shining upon); 'drive away' (by shining) (MW: 930)

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.