English Reference
noun · verb

backlash

n. · v.
US /ˈbæˌkɫæʃ/ UK /bˈæklæʃ/ back·lash UK spelling backlashes, backlashing

  1. 01 B2 Upper Intermediate

    n.a strong, negative reaction by a large group of people against something that has happened.

    n.a sudden and strong adverse reaction by a significant segment of the public to a social or political development.

    Simple

    The government faced a huge backlash from voters after they decided to raise taxes.

    In context

    The fashion brand experienced a severe public backlash after their latest advertising campaign was accused of being culturally insensitive.

    Usage

    Often used with the prepositions 'against' or 'from'.

  2. 02 C2 Proficiency Technical Science

    n.the small amount of movement or looseness between parts of a machine that are connected.

    n.the clearance or 'play' between mating components in a mechanical system, such as gears, which results in a delay or lost motion.

    Simple

    The old steering wheel had too much backlash, making the car hard to control.

    In context

    Precision engineering requires the minimisation of backlash within the gear assembly to ensure accurate positioning in robotic arms.

    playclearancelooseness
  3. 03 C2 Proficiency Formal

    v.to react in a sudden and angry way to something.

    v.to manifest a strong, sudden, and adverse reaction to a specific cause or event.

    Simple

    The community began to backlash against the new construction project in the park.

    In context

    Market forces may backlash if the central bank implements such aggressive interest rate hikes without sufficient warning.

But Ferrari's shares dropped the day after the Luce's launch, following backlash over the car.

BBC News· 17 Aug 2026

Police have used Flock to track romantic partners , external and stalk strangers, leading to growing public backlash against the company.

BBC News· 13 Aug 2026

From back- + lash.

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

This entry
Level B2 · Upper Intermediate
Frequency Frequent
Updated