English Reference

Word

locks

US/ˈɫɑks/

UK/lˈɒks/

Definitions

01fastening devices

A2 · Elementary Countable noun

n. devices used to keep doors, windows, or containers closed and secure.

n. mechanical or electronic fastening devices that prevent unauthorised access to doors, containers, or vehicles.

“Make sure all the locks on the windows are closed before you leave.”

“The security audit revealed that several locks on the perimeter gates were outdated and easily bypassed by intruders.”

Synonyms

02hair

B2 · Upper Intermediate Plural noun Literary

n. a person's hair, especially when it is long or curly.

n. a person's hair, often used in a literary or appreciative sense to describe long or flowing tresses.

“She shook her long golden locks as she laughed at the joke.”

“The poet described her flowing locks as a river of silk cascading over her shoulders in the moonlight.”

Synonyms

tressescurlshair

03dreadlocks

C1 · Advanced Plural noun Informal

n. a hairstyle where the hair is twisted into thick, rope-like strands.

n. a hairstyle consisting of rope-like strands of hair formed by matting or braiding.

“He has been growing his locks for over five years now.”

“The musician was easily recognisable by his waist-length locks and his signature colourful headwear.”

Synonyms

04canal gates

B2 · Upper Intermediate Countable noun

n. sections of a canal with gates that move boats up or down to different water levels.

n. enclosures in a canal or river with gates at each end, used for raising or lowering boats between levels.

“The boat had to wait for an hour to pass through the locks.”

“The engineering project involved modernising the nineteenth-century locks to accommodate larger commercial vessels on the inland waterway.”

Synonyms

waterwayssluices

05to fasten or secure

A2 · Elementary

v. to close something with a key or a code so it cannot be opened.

v. to fasten or secure a door, lid, or container using a mechanical or electronic device.

“He always locks the front door as soon as he gets home.”

“The automated system locks all laboratory exits at midnight to ensure the safety of the sensitive equipment inside.”

Usage

third-person singular form of the verb 'lock'

Antonyms

Real-World Examples

“Without water, its locks, which lift and lower ships at the beginning and end of the journey, would not function.”
Phys.org 4 Sept 2026
“It locks the front wheel at an odd angle so it can’t be ridden in a straight line, and it causes the motor to resist any attempt to roll the Olto in either direction.”
Ars Technica 5 Aug 2026

Word family

NOUN

locks(C1)

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
Frequent
Level
C1 · Advanced
Updated

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English Reference