What does mean ... Boastful fool who fought a swimming Match with Breccia, both of you daring and young and proud, exploring the deepest seas.
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I think this is referring to when Brecca, a childhood friend of Beowulf, had a really weird swimming competition in the open sea dressed in full armor and carrying swords. Apparently there are sea-monsters to fight! It is not certain who won the contest although Unferth claims it was Brecca.