English Reference

Word

leak

US/ˈɫik/

UK/lˈiːk/

Definitions

01a hole for liquid

B1 · Intermediate Countable noun

n. a small hole or crack that lets liquid or gas escape or enter.

n. a crack, hole, or fissure that permits the unintended entrance or escape of a fluid or gas.

“The plumber found a small leak in the pipe under the kitchen sink.”

“The engineers identified a microscopic leak in the fuel line, which had been causing a gradual drop in pressure during the test flight.”

Synonyms

Antonyms

02secret information

B2 · Upper Intermediate Countable noun

n. the act of giving secret information to the public or the media.

n. the intentional but unauthorized disclosure of confidential information to the public or the press.

“A leak from the government office revealed the new tax plans early.”

“The recent data leak has compromised the personal details of thousands of customers, leading to a massive investigation into the company's security protocols.”

03computing resource loss

C1 · Advanced Countable noun Computing Technical

n. when a computer program uses up memory and does not give it back.

n. the gradual depletion of system resources, such as memory, caused by a failure to deallocate previously reserved portions.

“The app crashes because of a memory leak that uses all the phone's RAM.”

“The software update was designed specifically to address a persistent memory leak that had been degrading server performance over long periods of uptime.”

Synonyms

04urination

C1 · Advanced Countable noun Informal · Slang · Vulgar

n. a very informal way to talk about going to the toilet.

n. an act of urination; used in informal or vulgar contexts.

“We stopped the car at a petrol station so he could take a leak.”

“After the long bus journey, several passengers were desperate to find a restroom and take a leak.”

Synonyms

05to escape through a hole

B1 · Intermediate

v. to let liquid or gas out through a hole by accident.

v. to allow fluid or gas to pass through an opening that should be sealed; may be used transitively or intransitively.

“Water started to leak from the ceiling after the heavy rain.”

“The damaged container began to leak toxic fumes into the warehouse, forcing an immediate evacuation of all staff members.”

Synonyms

Antonyms

06to share secrets

B2 · Upper Intermediate

v. to give secret information to someone, like a reporter.

v. to disclose confidential information surreptitiously or anonymously to an outside party.

“Someone in the company leaked the photos of the new phone before the launch.”

“An anonymous source leaked the classified documents to the newspaper, sparking a nationwide debate on government transparency.”

Synonyms

Antonyms

Collocations

Common phrases and expressions where native English speakers use the word “leak” in context.

Verb

01. investigate a leak

“The government has appointed a special committee to investigate the leak of classified documents.”

verb + noun

02. plug a leak

“The plumber managed to plug the leak in the pipe before the basement flooded.”

verb + noun

03. spring a leak

“Our old rowing boat suddenly sprang a leak in the middle of the lake.”

verb + noun

Adjective

04. massive leak

“The company faced a PR disaster following a massive leak of customer credit card details.”

adj + noun

05. slow leak

“I didn't notice the slow leak in the tire until it was completely flat the next morning.”

adj + noun

Noun

06. gas leak

“The entire apartment block was evacuated due to a suspected gas leak.”

noun + noun

07. leak of information

“The recent leak of information has compromised the safety of several undercover agents.”

noun + of + noun

Real-World Examples

“The i Paper focuses on higher water bill , external s on the way from five companies, which it says lose 1.2 billion litres a day because of leaks.”
BBC News 14 Aug 2026
“Burnham said he understood why people were angry as they had been asked to pay more for years while pollution incidents and leaks continued.”
BBC News 13 Aug 2026

Etymology

From Middle English leken (“to let water in or out”), from Old English lecan (“to leak”), Middle Dutch leken (“to leak, drip”) or Old Norse leka (“to leak, drip”); all from Proto-Germanic lekaną (“to leak, drain”), from Proto-Indo-European leg-, leǵ- (“to leak”). Cognate with Dutch lekken (“to leak”), German lechen, lecken (“to leak”), Danish lække (“to leak”), Swedish läcka (“to leak”), Icelandic leka (“to leak”). Related also to Old English leċċan (“to water, wet”), Albanian lag, lak (“I damp, make wet”). See also leach, lake. (divulgation, disclosure of information): Compare typologically Bulgarian изтичане (iztičane), Polish przeciek, Russian уте́чка (utéčka) (akin to течь impf or f (tečʹ)).

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

Word family

NOUN

leak(C1)

ADJECTIVE

Related words

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
Common
Level
C1 · AdvancedOxford
Updated

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English Reference