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CORS

Cross-Origin Resource Sharing.

/kɔːrz/Documented since 2000s2000sGen ZmainstreamCurrent5.9K viewsLast reviewed Jun 29, 2026+ Add a definition
⚡ Tech, Dev & AI
4 definitions
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Etymology timeline

Born ~2006 · 1 year of recorded use
2006Born2026: 1 citationToday, 2026
Late-Millennial / Web 2.0 eraSee decade cohort →

Seen in the wild

Definitions

Global
+1789100%
#1·Apr 23, 2026GlobalWork-OK

Cross-Origin Resource Sharing. The browser security feature that blocks your frontend from calling APIs on a different domain unless the server explicitly allows it. Universal source of developer despair.

"My request works in Postman but fails in the browser. CORS. Always CORS."
Origin: Tech / AI / developer industry term.
For parents

CORS means Cross-Origin Resource Sharing. It's mostly used in casual online conversation. It's casual and generally safe with friends and online. It's standard online vocabulary; nothing inherently concerning about hearing it.

For ESL learners

"CORS" is slang. It means: Cross-Origin Resource Sharing. Register: casual. Use it in: casual conversation and online posts. Avoid in: formal writing and professional emails.

Cluster: technology
Heard in the wild
  • “Informació, cançons i lletres de l'àlbum Cors que encara bateguen (2026) del grup 'JaBeat' a Viasona”

    — Bluesky· May 2026
  • “The cor anglais (UK: , US: or original French: [kɔʁ ɑ̃ɡlɛ]; plural: cors anglais), or English horn (mainly North America), is a double-reed woodwind instrument in the oboe family.”

  • “It's not only a pain in you butt, but it also makes your requests slow through these extra pre-flight round-trips.<br>I have hope that we can remove it, though, in new versions of HTTP.<br>CORS only exists because XMLHTTPRequest broke the assumptions of web 1.0 servers.”

  • “There used to be footguns of being able to disable CORS, and devs would provide this as a work around.”

  • “# Cross-origin resource sharing Cross-origin resource sharing Mechanism to request restricted resources on a web page from another domain "CORS" redirects here; not to be confused with [Continuously Operating Reference Station](https://en.wikipedia.org/wiki/Continuously_Operating_Reference_Station "Continuously Operating Reference Station").”

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Global
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#2·Apr 24, 2026GlobalNeutral

CORS as a rite of passage: every web developer has spent at least one afternoon blocked by a mysterious preflight OPTIONS request. The frustration inspired countless Stack Overflow threads and at least one Chrome extension called "CORS please."

"Was ‘busy' from 2 to 5 — really just fighting CORS again."
Origin: Tech / AI / developer industry term.
Cluster: technology
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Global
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#3·Apr 24, 2026GlobalNeutral

The stages of CORS grief: (1) wait, it worked yesterday; (2) browser hates me personally; (3) let me disable security; (4) fine — I'll read the preflight docs; (5) added `Access-Control-Allow-Origin: *`. Engineers have all cycled through these stages.

"Midnight. Still debugging CORS. My relationship with OPTIONS requests is complicated."
Origin: Tech / AI / developer industry term.
Cluster: technology
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Global
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#4·Apr 24, 2026GlobalWork-OK

CORS therapy — the mental process of walking yourself through what the browser actually enforces: preflight OPTIONS, Access-Control-Allow-Origin, credentials mode. Most of the fix is understanding the problem; most of the debugging is pretending you already did.

"Spent 2 hours on CORS. Turns out my backend didn't return the header. Five-minute fix. Two hours of hate."
Origin: Tech / AI / developer industry term.
Cluster: technology
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For specific readers

CORS means Cross-Origin Resource Sharing. It's mostly used in casual online conversation. It's casual and generally safe with friends and online. It's standard online vocabulary; nothing inherently concerning about hearing it.

Why is this section here?

Slang is read by different audiences for very different reasons. The For parents view re-explains the term in plain, non-judgemental language so a caregiver can understand what their child means without needing the surrounding subculture. The For English learners view focuses on register (when it's safe to use), formal alternatives, and common mistakes — what a textbook won't teach you.

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⚡About Tech, Dev & AI slang

The vocabulary of software engineers, AI researchers, and anyone living in a terminal or on GitHub — from LLM to MCP, CORS to vibe coding, agentic to enshittification.

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