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day one

(often initial capital letters) the very first day or beginning of something.
Origin of day one
1975-80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for day-one
Historical Examples
  • It was a sunny, summer day-one of those days which incline the heart to prayer, and bring tears of happiness to the eyes.

Slang definitions & phrases for day-one

day one

noun phrase

The first day; the very beginning of something: You weren't happy doing this from day one

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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