Comparative evidence

h₁lengʷʰ

• OInd. raṁh-/raṅh- 'hasten' (Whitney 1885: 133);  'speed' (trans. and intrans.); 'cause to go', 'cause to flow'; 'go', 'flow'; 'speak', 'shine' (MW: 859)

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.