Comparative evidence

dʰu̯en

• OInd. dhvan- 'sound', 'roar', 'make a noise', 'echo', 'reverberate', 'mean', 'imply' (MW: 522; Whitney 1885: 86)

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.