Comparative evidence

1.dʰreu̯gʰ

• OInd. druh- 'be hostile' (Whitney 1885: 80); 'hurt', 'seek to harm', bear hatred', 'be a rival' (MW: 502)

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