English Reference

Word

safe

US/ˈseɪf/

UK/sˈeɪf/

Definitions

01not in danger

A2 · Elementary

adj. not in danger or likely to be hurt.

adj. free from danger, injury, or the threat of harm.

“The children are safe inside the house while it rains outside.”

“The rescue team confirmed that all hikers were safe and accounted for after the storm passed through the valley.”

02free from risk

B1 · Intermediate

adj. not likely to cause any trouble, mistakes, or loss.

adj. involving little or no risk of failure, error, or financial loss.

“Putting your money in a bank is usually a safe investment.”

“The board decided that a conservative expansion strategy was the safe choice given the current volatility of the global market.”

Antonyms

03cautious

B2 · Upper Intermediate

adj. avoiding danger or not taking any chances.

adj. characterised by caution and a desire to avoid unnecessary risks.

“It is better to be safe than sorry when driving in the snow.”

“The manager took a safe approach to the negotiations, refusing to commit to any long-term contracts until the budget was finalised.”

Synonyms

Antonyms

04cool or okay

C1 · Advanced British English · Slang

adj. used to say that something is good, cool, or that you agree.

adj. used as a term of approbation or to indicate that a situation is acceptable.

“Don't worry about the money, it's safe.”

“He's a safe guy, you can trust him to help us out with the move.”

Teaching tip

Common in Multicultural London English (MLE); learners should be aware it sounds very informal and regional.

Synonyms

05programming

C1 · Advanced Computing Technical

adj. a way of writing computer code that prevents common errors.

adj. referring to a programming language or operation that prevents certain types of memory or logic errors.

“Rust is known for being a memory-safe language.”

“The developer prioritised thread-safe operations to ensure the application would not crash under heavy concurrent loads.”

Synonyms

Antonyms

06locking box

B1 · Intermediate Countable noun

n. a strong metal box with a lock used for keeping money or valuable things.

n. a reinforced container, typically made of steel, equipped with a complex lock for the secure storage of valuables.

“The hotel room has a small safe for your passport and cash.”

“The burglars were unable to crack the heavy safe, despite having several hours to work on the combination lock.”

Synonyms

strongboxvault

Etymology

From Middle English sauf, safe, saf, saaf, from Old French sauf, saulf, salf (“safe”), from Latin salvus (“whole, safe”), from Proto-Italic salwos, from Proto-Indo-European solh₂- (“whole, every”). Displaced native Old English sicor (secure, sure).

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

Idioms

Domains

LawProgramming

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.A2 KeyIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.3.0–4.0TOEFL 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: 2.0–2.524–43TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.225–549
Frequency
Very common
Level
A2 · ElementaryOxford
Updated

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English Reference