knock
An abrupt rapping sound, as from an impact of a hard object against wood.
Other meanings
A sharp impact.
“He took a knock on the head.”
preignition, a type of abnormal combustion occurring in spark ignition engines caused by self-ignition; also, the characteristic knocking sound associated with it.
Related words
- antiknock
- knock knock
- school of hard knocks
- cop knock
- diesel knock
- knock box
- knock knee
- knock shop
- knock-about
- knock-back
- knock-for-knock agreement
- knock-knee
Example sentences
Word history
From Old English "cnocian".
Where this comes from
This definition is adapted from “knock” on Wiktionary, by its contributors; example sentences are from Tatoeba, credited to their authors above, published under CC BY-SA 4.0. This page is published under the same licence.