# Hard Fork

idiom · CEFR C1

Source: https://englishreference.com/idiom/hard-fork
Updated: 2026-07-19

## Meaning

A protocol change that is incompatible with previous versions, often splitting off a separate blockchain.

## Examples

- The community split after the hard fork.
- Bitcoin Cash was created through a hard fork of the original Bitcoin blockchain.
- Because a hard fork is not backward-compatible, every node must upgrade or be stranded on an abandoned chain.

## Origin

Hard signals that adopting the new rules is mandatory. (disputed)

---

From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.