Again Vibhishaṇ sadly spoke: “His was the hero arm that broke Embattled Gods’ and Indra’s might, Unconquered ere to-day in fight. He rushed against thee, fought and fell, As Ocean, when his waters swell, Hurling his might against a rock, Falls spent and shattered by the shock.

In plain words: Vibhishana says Ravana had once defeated the gods and Indra and was never beaten before. He threw himself at Rama and was broken, like ocean waves smashing against a rock.