English Reference
verb · noun

deploy

v. · n.
US /dɪˈpɫɔɪ/ UK /dɪplˈɔɪ/ de·ploy UK spelling deployed, deploying, deploys

  1. 01 B2 Upper Intermediate

    v.to move soldiers or equipment into a position where they are ready for action.

    v.to position military forces or resources strategically for a specific mission or operation.

    Simple

    The government decided to deploy more police officers to the city centre during the festival.

    In context

    The peacekeeping force was deployed to the border region to monitor the ceasefire and prevent further escalations of violence.

    Usage

    Often used in the passive voice when referring to troops.

  2. 02 C1 Advanced Technical Computing

    v.to make a computer program or system ready for people to use.

    v.to move a software application or update from a development environment to a live production environment.

    Simple

    The team will deploy the new version of the app tonight while most users are asleep.

    In context

    After rigorous beta testing, the engineers finally deployed the security patch across the entire corporate network to mitigate the vulnerability.

    Usage

    Commonly used as a transitive verb with software or systems as the object.

    uninstallrollback
  3. 03 B2 Upper Intermediate

    v.to open up or unfold so that something can work.

    v.to move from a stowed or folded position into a functional, open state.

    Simple

    The car's airbags are designed to deploy instantly if there is a crash.

    In context

    The satellite's solar panels failed to deploy correctly, leaving the craft with a critically low power supply shortly after it reached orbit.

  4. 04 C2 Proficiency Archaic

    n.the act of moving things or people into position.

    n.the action of bringing resources into effective action; a synonym for deployment.

    Simple

    The general ordered a rapid deploy of the reserve units.

    In context

    In historical military texts, one might find 'deploy' used as a noun to describe the tactical arrangement of a battalion.

    Teacher's tip

    This noun form is very rare in modern English; speakers almost always use 'deployment' instead.

Usage deploy police · deployed to the area

The majority of his forces are deployed in more than 80 countries worldwide, Bradley said.

The Guardian· 14 Aug 2026

The US has deployed artificial intelligence tools to catch transshipment efforts, it added.

BBC News· 14 Aug 2026

Borrowed from French déployer (“to unroll, unfold”), from Old French desploiier, itself from des- + ploiier, or possibly from Late Latin displicāre (“to unfold, display”), from Latin dis- (“apart”) + plicare (“to fold”). Compare Middle English desployen, dysployen (“to unfold, display”). Doublet of display.

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

This entry
Origin Latin dis-
Level C1 · Advanced
Frequency Frequent
Updated