大胜 can be both verb ('to defeat decisively', followed by the loser) and noun ('a big win'). Common in sports and military headlines. Opposite: 大败 (dàbài) — though note 大败 can also mean 'to rout', so context matters.
mistakes
A 胜 B and A 败 B can both mean 'A beat B'. When reading sports news, 'A 大胜 B' = A wins big; but 'A 大败 B' also = A routs B (not B defeats A). Trust the subject position, not the verb.
