day one

noun
(often initial capital letters) the very first day or beginning of something.

Origin:
1975–80

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Slang Dictionary

day one definition


  1. n.
    the first day. (Often with since.) : You haven't done anything right since day one! You're fired!
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw Hill.
Cite This Source
00:10
Day one is always a great word to know.
So is lollapalooza. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a gadget; dingus; thingumbob.
Example sentences
From day one, she's always been horrible with walks.
It's been a big part of popular music since day one.
The day one of you guys makes a discovery, you'll have our attention.
It's an old saying among football coaches that one is fired the day one is
  hired.
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