Comparative evidence

deh₂u̯

• OInd. du-/dū- ‘burn’, ‘be burnt’ (MW: 482-483; Whitney 1885: 75)

Derivatives

• OInd. dava ‘wood on fire’, ‘fire’, ‘heat’, ‘fever’ (MW: 471)

• OInd. davathu ‘heat’, ‘pain’, ‘inflammation’ (MW: 471)

• OInd. dāvá ‘conflagration’, ‘fire’, ‘heat’, ‘distress’ (MW: 476)

• OInd. dūyana ‘heat’ (of the body), ‘fever’ (MW: 489)

• OInd. doman ‘pain’, ‘inconvenience’ (MW: 498)

Whitney 1885: 75: “For the form RV. daviṣāṇi assume a √ 2 du- = 1 dīv-«play»”.

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.