Comparative evidence

ḱeu̯dʰ

• OInd. śudh-/śundh- 'purify' (Whitney 1885: 174); 'become pure', 'be pure'; 'be cleared'; 'be cleansed', 'be purified', 'become pure'; 'become free from doubts'; 'be cleared from blame', 'be excusable' (MW: 1082)

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.