Word
knocking
Phoneticsknock·ing, stress on the first syllable
US/ˈnɑkɪŋ/
UK/nˈɒkɪŋ/
Definitions
01sound on a door
A2 · Elementary Uncountable noun
n. the sound made when someone hits a door or a hard surface with their hand.
n. the percussive sound produced by striking a surface, typically a door, to attract attention.
“I heard a loud knocking at the front door late last night.”
“The persistent knocking at the gate eventually roused the porter, who had fallen asleep during his midnight shift.”
Antonyms
02engine noise
C1 · Advanced Uncountable noun Science Technical
n. a repetitive metallic sound from an engine that is not working correctly.
n. a rhythmic metallic sound in an internal combustion engine, often indicating pre-ignition or mechanical wear.
“The mechanic said the knocking in the engine was caused by bad fuel.”
“The driver noticed a distinct knocking coming from the cylinder head whenever the vehicle attempted to accelerate up a steep incline.”
Usage
Often used as an uncountable noun when referring to the mechanical phenomenon.
Collocations
Common phrases and expressions where native English speakers use the word “knocking” in context.
Word family
VERB
NOUN
Idioms
- 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
- Frequent
- Level
- A2 · Elementary
- Updated
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