noun, noun or participle which takes 'suru', intransitive verb
great victory; big win; huge profit; killing
Used for a decisive win in sports, games, or contests, and figuratively for a large financial gain. The 'killing' gloss is a colloquial financial sense.
昨日の試合は大勝ちだった。
Yesterday's game was a great victory.
株で大勝ちした。
I made a killing in stocks.