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noun Common

knocking

NO-kihng

Knocking (noun) means a repeated rapping sound, such as on a door. Example: “There was a loud knocking at the window in the middle of the night.”

noun
1
A repeated rapping sound, such as on a door.
"There was a loud knocking at the window in the middle of the night."
2
A rattling or pinging sound from an engine caused by fuel igniting unevenly.
"A persistent knocking from the engine suggested the fuel was the wrong grade."

How to Use Knocking

Learner’s notes

In plain EnglishThe sound of repeated knocks, whether on a door or from a faulty engine.

Common pairings
engine knocking a knocking sound

Word Forms

knockings plural

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There was a loud _____ at the window in the middle of the night.

Related Words

Rhymes for knocking

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Frequently Asked Questions

What does “knocking” mean?

The word “knocking” means a repeated rapping sound, such as on a door. In plain terms, the sound of repeated knocks, whether on a door or from a faulty engine.

How do you pronounce “knocking”?

“Knocking” is pronounced NO-kihng (/ˈnɑkɪŋ/ in IPA).

How do you use “knocking” in a sentence?

Here is “knocking” used in a sentence: “There was a loud knocking at the window in the middle of the night.”

What part of speech is “knocking”?

“Knocking” is a noun.

Is “knocking” a common word?

“Knocking” is a fairly common word in modern English.

How many meanings does “knocking” have?

“Knocking” has 2 distinct senses listed in this dictionary. The most common is: a repeated rapping sound, such as on a door.

What causes knocking in a car engine?

Engine knocking is a rattling or pinging sound caused by fuel igniting unevenly in the cylinders instead of burning smoothly. This uneven combustion produces the characteristic metallic knock or ping that a driver may hear, often when the engine is under load.

What is the difference between "knocking" on a door and engine "knocking"?

When it refers to a door, knocking is a repeated rapping sound made to get attention or ask to enter. In an engine, knocking is a rattling or pinging sound caused by fuel igniting unevenly. The two senses share the idea of a repeated striking sound but occur in very different contexts.

What is the difference between "knocking" and "banging"?

Knocking is a repeated rapping sound, such as knuckles on a door, and tends to be firm but moderate. Banging suggests louder, heavier, more forceful blows. Knocking on a door is a polite signal, whereas banging implies urgency or frustration.

Is "knocking" always a bad sign?

Not necessarily. Knocking on a door is simply a repeated rapping sound used to get attention or ask to enter. Engine knocking, however, is a rattling or pinging caused by fuel igniting unevenly, and it is generally an unwanted sound that points to a problem with combustion.

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