Definition of big one
1 informal : a thousand dollars The house in the background, we bought it for 70 grand in 1967, it would go for two hundred big ones now, easy …— John Updike
2 informal : an extravagant lie : whopper Talking about lying, I thought, I had just told a big one.— Elizabeth Chandler
3 the big one or less commonly the Big One : an extremely large and destructive earthquake … the prediction that the Big One may come in December is triggering tremors up and down the Mississippi Valley.— Michael J. McCarthy
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