vacobhiḥ - with harsh words; paruṣaiḥ - very rough and cruel; indram - King Indra; ardayantaḥ - chastising, piercing; asya - of Indra; marmasu - in the heart, etc.; śaraiḥ - with arrows; avākiran - covered all around; meghāḥ - clouds; dhārābhiḥ - with showers of rain; iva - just as; parvatam - a mountain.

Rebuking Indra with harsh, cruel words that were piercing to the heart, these demons showered him with arrows, just as torrents of rain wash a great mountain.