404
In real, traceable use. Part of the curated seed collection; community review is coming.
Meaning · English
Not found, especially of a web page on the Internet.
Register: slang
Where it’s used:
Used
American English
Examples
Bill was 404 all morning.
Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30)
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Common questions
What does “404” mean?
Not found, especially of a web page on the Internet.
Is “404” formal or informal?
404 is generally slang.