# deactivate

/ˌdiˈæktɪˌveɪt/ (US) · /diːˈæktɪvˌeɪt/ (UK) · CEFR B2 · Verb

Source: https://englishreference.com/word/deactivate
Updated: 2026-05-18

## Definition

to turn off or stop a machine, a system, or a feature. You use this when you want to disable something that is currently working.

For teachers: to disable or turn off a device, system, or function. Transitive — requires a direct object.

## Examples

- You need to deactivate the alarm before you leave.
- The technician will deactivate the server to perform a full system update during the weekend.
- Security protocols require that the administrator deactivate the firewall before attempting to install the new software to prevent any potential conflicts during the installation process.

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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.