day one

noun

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

Word History and Origins

Origin of day one¹

First recorded in 1975–80

Example Sentences

The president-elect has also vowed to fire Gary Gensler, the chairman of the Securities and Exchange Commission, on day one.

From BBC

"We know that on day one he is going to launch the largest mass deportation of illegal immigrants in American history," she said.

From BBC

Another day one promise was to end birthright citizenship - the 150-year-old principle that says anyone born on US soil is an American citizen.

From BBC

Trump has promised to be a dictator on “day one.”

From Salon

During his campaign, Trump promised to deport millions of immigrants living in the U.S. illegally, carrying out the “largest deportation operation in American history” on Day One.

From Los Angeles Times

Related Words

• birth
• creation
• dawn
• inauguration
• inception
• introduction
• onset
• opening
• outset
• starting point
• top