English Reference
verb

quash

v.
US /ˈkwɔʃ/ UK /kwˈɒʃ/ quash UK spelling quashed, quashes

  1. 01 C1 Advanced Formal

    to stop something by force, such as a protest, a rebellion, or a rumour.

    to suppress or extinguish something completely, typically by force or authority.

    Simple

    The government moved quickly to quash the rumours before they caused a panic.

    In context

    The administration attempted to quash the growing rebellion by imposing a strict curfew and limiting public gatherings.

    Usage

    Often used with abstract nouns like 'rumours', 'hopes', or 'rebellion'.

    encouragefoment
  2. 02 C1 Advanced FormalTechnical Law

    to officially state that a legal decision or document is no longer valid.

    to set aside or annul a legal proceeding, subpoena, or conviction.

    Simple

    The judge decided to quash the conviction after new evidence was found.

    In context

    The high court moved to quash the subpoena, ruling that the requested documents were protected by attorney-client privilege.

    Usage

    Takes a direct object, typically a legal instrument like a 'conviction', 'verdict', or 'subpoena'.

Production had been approved by the previous Conservative government, but those decisions were quashed after a legal challenge by Greenpeace, leaving Labour ministers to decide whether drilling should go ahead.

The Guardian· 19 Aug 2026

However, those decisions were quashed after a legal challenge from the campaign group Greenpeace, pending more detailed climate assessments.

The Guardian· 17 Aug 2026

From Middle English quaschen, quasshen, cwessen, quassen, from Old French quasser, from Latin quassāre, under the influence of cassō (“to annul”), from Latin quatiō (“I shake”), from Proto-Indo-European *kʷeh₁t- (“to shake”) (same root for the English words: pasta, paste, pastiche, pastry). Cognate with Dutch kwetsen (“to hurt, injure”), German quetschen (“to crush, squash”), Spanish quejar (“to complain”).

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin ine-pro *kʷeh₁t-
Level C1 · Advanced
Frequency Occasional
Updated