English Reference

Word

jailbreak

Phoneticsjail·break, stress on the first syllable

US/ˈdʒeɪɫˌbɹeɪk/

UK/dʒˈeɪlbɹeɪk/

Countable noun

Definition

n. the act of removing software restrictions on a device like a phone or tablet. This lets you install apps or change settings that the manufacturer usually blocks.

n. the process of removing software restrictions imposed by the manufacturer on a device's operating system. This typically involves exploiting security vulnerabilities to gain root access, allowing the installation of unauthorized software.

Examples

“He performed a jailbreak on his old phone to install custom themes.”

“After the latest jailbreak was released, many users modified their tablets to run third-party applications not found in the official store.”

“While a jailbreak offers greater customization and control over the hardware, it often voids the manufacturer's warranty and may leave the device vulnerable to security threats.”

Examples

simple

“He performed a jailbreak on his old phone to install custom themes.”

contextual

“After the latest jailbreak was released, many users modified their tablets to run third-party applications not found in the official store.”

complex

“While a jailbreak offers greater customization and control over the hardware, it often voids the manufacturer's warranty and may leave the device vulnerable to security threats.”

Usage

Often used as a compound noun in computing; can also function as a verb.

Real-World Examples

“It arose during a process called "jailbreaking", where researchers use a series of complex instructions to see if AI tools ignore guardrails - which Mindgard said should have stopped Kimi from discussing concerning topics.”
BBC News 29 Sept 2026
“He’s been falsely accused of aiding and abetting a jailbreak and is facing imminent eviction from his rented family home.”
The Guardian 3 Sept 2026

Etymology

From jail + break.

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

Word family

Domain

Computing

This entry

Exam level
CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.C1 AdvancedIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.7.0–8.0TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 5.0–5.595–113TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.945–990
Frequency
Occasional
Level
C1 · Advanced
Updated

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English Reference