English Reference

Word

clog

US/ˈkɫɑɡ/

UK/klˈɒɡ/

Definitions

01to block a passage

B1 · Intermediate

v. to block a pipe, road, or opening so that nothing can get through.

v. to obstruct or hinder passage through a channel, pipe, or opening, often by an accumulation of material.

“Hair and soap can easily clog the shower drain if you are not careful.”

“The narrow arterial roads were quickly clogged by heavy snow, bringing the city's entire transport network to a standstill within hours.”

Synonyms

Antonyms

02to hinder or burden

C1 · Advanced Literary

v. to make it difficult for someone to move or act by giving them too much to carry or do.

v. to encumber or hamper movement or progress; to load with something that impedes efficiency.

“The new rules clog the system and make it harder for small businesses.”

“The legal proceedings were clogged by endless bureaucratic delays, preventing the plaintiff from reaching a resolution for several years.”

Antonyms

03mortgage law

C2 · Proficiency Law Technical · Formal

v. to prevent a borrower from getting their property back after paying a debt.

v. to enforce a lender's right that prevents a borrower from exercising their equitable right to redeem a mortgage.

“The court ruled that the contract was an illegal clog on the borrower's rights.”

“The judge determined that the option to purchase the property constituted a clog on the equity of redemption and was therefore void.”

Synonyms

restrictfetter

04a blockage

B2 · Upper Intermediate Countable noun

n. something that blocks a pipe or a tube.

n. a physical obstruction or accumulation of material that prevents flow.

“The plumber had to use a special tool to remove a stubborn clog in the pipes.”

“A significant clog in the cooling system caused the engine to overheat during the long journey across the desert.”

05wooden shoe

B1 · Intermediate Countable noun

n. a shoe made entirely or mostly of wood.

n. a type of footwear with a thick, typically wooden sole, often associated with traditional European folk dress.

“In the souvenir shop, they sold tiny painted clogs from the Netherlands.”

“The rhythmic sound of wooden clogs on the cobblestone streets echoed through the village during the traditional festival.”

Synonyms

sabat

Real-World Examples

“Other retail reviews detailed similar pump issues – the component clogs easily and it’s difficult to get to the product at the bottom of the bottle.”
The Guardian 29 Aug 2026
“Granted, its window closed before the new campaign gets under way and they didn’t have a World Cup clogging up the summer this year.”
The Guardian 4 Sept 2026

Etymology

Unknown; perhaps from Middle English clog (“weight attached to the leg of an animal to impede movement”). Perhaps of North Germanic origin and derived from Proto-Germanic *klumpô (“lump, mass, clasp”); compare Old Norse klugu, klogo (“knotty tree log”), Dutch klomp.

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

Idioms

01. clog up

Domain

Law

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