Comparative evidence

h₃peu̯s, peu̯s

• OInd. puṣ- 'thrive' (Whitney 1885: 98); 'be nourished', 'flourish', 'prosper'; 'cause to thrive', 'cause to prosper', 'nourish', 'foster', 'augment', 'increase', 'further', 'promote', 'fulfil' (a wish), 'develop', 'unfold', 'display', 'gain', 'obtain', 'enjoy', 'possess' (MW: 638)

• OInd. puṣ- 'nourishing', 'causing to thrive'; 'showing', 'displaying' (MW: 638)

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.