Comparative evidence

h₂eldʰ

• OInd. ṛdh- 'thrive' (Whitney 1885: 15); 'grow', 'increase', 'prosper', 'succeed'; 'cause to increase', 'cause to prosper', 'promote', 'make prosperous', 'accomplish' (MW: 226)

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.