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Glite Dictionary
🌊 WWII invasion day 📅 Important day
D-day

D-day

1 4.8
A day when a very important action or decision happens
  • noun
  • /ˈdiːˌdeɪ/
  • Informal
translation icon : día decisivo
  • For Christ's sake, Milo, they couldn't have made more noise on D-day!

But if that's true, what we need is another D-Day, not another Vietnam.

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Examples

  • Everything went to hell in a handbasket as soon as as D-Day began.

  • It is because of the metaverse and a really big D-Day coming up for the Sandbox token.

  • I'm beyond thankful for that D-Day, for that moment when I saw myself as I really was.

    Rich Roll

  • But if that's true, what we need is another D-Day, not another Vietnam.

    ReasonTV

  • And a month before the D-Day was a maneuver called Slapped in Sands.

  • D-Day changed all that.

    A Bridge Too Far (1977)

  • Tomorrow is D-day for the project, and everyone needs to be prepared for the final presentation.

  • After months of planning, the team finally set a D-day to launch their new product.

  • The D-day for the election was marked on everyone's calendar, as it would determine the future leadership.

Synonyms

day of reckoning
vsD-day
  • Informal
8 8.0

A time when people must face the results of their past actions

is a date for decisive action or decision rather than judgement

How Critical

D-day
  • Informal
1 4.8

Surface Forms

D-day singular
D-days plural

Morphology

D-day = day (semi-transparent) = D + day

The figurative sense ('decisive day') is an extension of the military term and is partly inferable from 'day' but still depends on convention.

Etymology

A helpful way to remember the modern meaning of D-day is to think of that military code. Because it named the start of an important operation, people now use D-day for any 'decisive' or 'make-or-break' day.