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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“Big one.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/big%20one. Accessed 20 May. 2022.
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Time Traveler for big one
The first known use of big one was circa 1863
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