knuckle under: meaning, definition, pronunciation and examples
C1/C2Informal/Idiomatic
Quick answer
What does “knuckle under” mean?
To submit to authority, pressure, or force.
Audio
Pronunciation
Definition
Meaning and Definition
To submit to authority, pressure, or force; to give in or yield.
To accept defeat in an argument or conflict; to capitulate after resistance.
Dialectal Variation
British vs American Usage
Differences
The phrase is used and understood in both varieties. No significant structural differences.
Connotations
In both, it can imply weakness or pragmatic surrender. Perhaps slightly more common in American narrative contexts (e.g., describing someone refusing to 'knuckle under' to bullies).
Frequency
Low-to-medium frequency in both; not a daily expression but recognized by educated speakers.
Grammar
How to Use “knuckle under” in a Sentence
[Subject] knuckle under (to [Authority/Pressure/Person])Vocabulary
Collocations
Examples
Examples of “knuckle under” in a Sentence
verb
British English
- The protestors held out for days but eventually knuckled under to the government's threats.
- He's too stubborn to knuckle under, even when he's clearly wrong.
American English
- The team refused to knuckle under to their rivals' aggressive tactics.
- After the court order, the company finally knuckled under and paid the fine.
adverb
British English
- No adverbial form in common use.
American English
- No adverbial form in common use.
adjective
British English
- No adjectival form in common use.
American English
- No adjectival form in common use.
Usage
Meaning in Context
Business
Rare. Could describe a company yielding to regulatory pressure or a competitor.
Academic
Very rare. More likely in historical/political analysis describing groups submitting to power.
Everyday
Used in personal conflicts, parenting (children refusing to knuckle under to rules), or workplace dynamics.
Technical
Not used.
Watch out
Common Mistakes When Using “knuckle under”
- Incorrect preposition: 'knuckle under for' (correct: 'knuckle under to').
- Using it as a transitive verb: 'He knuckled under them.' (correct: 'He knuckled under to them.')
FAQ
Frequently Asked Questions
It is informal and idiomatic. Avoid it in very formal writing.
'Knuckle under' means to submit or yield. 'Knuckle down' means to start working hard on something.
Rarely. It usually implies a negative, reluctant submission. A positive submission (like agreeing wisely) would use 'yield' or 'concede'.
No. It is intransitive. The source of pressure is introduced with 'to' (e.g., 'knuckle under to pressure').
To submit to authority, pressure, or force.
Knuckle under: in British English it is pronounced /ˌnʌk.əl ˈʌn.dər/, and in American English it is pronounced /ˌnʌk.əl ˈʌn.dɚ/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “toe the line”
- “give up the fight”
- “throw in the towel”
Learning
Memory Aids
Mnemonic
Imagine making a fist (with your knuckles) to fight, then turning your hand over (under) in a gesture of surrender.
Conceptual Metaphor
SUBMISSION IS PHYSICAL LOWERING/BOWING (knuckling under implies lowering oneself).
Practice
Quiz
What is the closest meaning of 'knuckle under' in the sentence: 'The rebels refused to knuckle under, even when facing certain defeat.'?