case-harden: meaning, definition, pronunciation and examples
LowTechnical, Formal, Figurative/Literary
Quick answer
What does “case-harden” mean?
To make the outer surface of a metal (especially steel) extremely hard through a heating and quenching process, while leaving the inner core relatively tough and flexible.
Audio
Pronunciation
Definition
Meaning and Definition
To make the outer surface of a metal (especially steel) extremely hard through a heating and quenching process, while leaving the inner core relatively tough and flexible.
To make a person emotionally tough, callous, or resistant to feeling through repeated exposure to difficult experiences.
Dialectal Variation
British vs American Usage
Differences
No significant spelling or meaning differences. The hyphenated form is standard in both. The figurative use may be slightly more common in British literary contexts.
Connotations
Identical connotations in both varieties.
Frequency
Very low frequency in general language; mostly confined to metallurgy and stylistically deliberate figurative use in both regions.
Grammar
How to Use “case-harden” in a Sentence
[Someone/Something] case-hardens [something] [through/by exposure to something][Something] becomes case-hardenedVocabulary
Collocations
Examples
Examples of “case-harden” in a Sentence
verb
British English
- The workshop will case-harden the camshaft using a specialised gas nitriding technique.
- His years in the prison service case-hardened him to human suffering.
American English
- The manufacturer case-hardens the gear teeth for increased durability.
- The brutal campaign trail case-hardened the young politician.
adverb
British English
- The metal was treated case-hardeningly. (Extremely rare/constructed)
- N/A
American English
- N/A
- N/A
adjective
British English
- The case-hardened steel component showed excellent wear resistance.
- He had a case-hardened attitude towards financial risk.
American English
- We need a case-hardened surface on this bearing.
- Her case-hardened demeanor hid a surprising kindness.
Usage
Meaning in Context
Business
Rare; could be used metaphorically to describe a manager hardened by market pressures: "Years of corporate warfare have case-hardened her."
Academic
Used in materials science and engineering for the technical process.
Everyday
Virtually unused in casual conversation.
Technical
Primary domain. Describes a specific thermochemical process (e.g., carburising, nitriding) used to increase wear resistance.
Watch out
Common Mistakes When Using “case-harden”
- Using it as a synonym for simple 'harden' without the surface-specific or metaphorical nuance. Misspelling as one word: "caseharden". Incorrect past participle: "case-hardened" (correct) not "case-harden". Using it in an informal context where it sounds unnatural.
FAQ
Frequently Asked Questions
The standard form is hyphenated, especially when used attributively (case-hardened steel). The verb is 'to case-harden'.
Yes, but this is a metaphorical extension of the technical term. It is a deliberate stylistic choice implying the person has developed a tough, often unfeeling, exterior.
In metallurgy, 'tempering' reduces brittleness after hardening by reheating. 'Case-hardening' specifically hardens only the surface (the 'case'). Figuratively, 'temper' can imply strengthening *with* resilience, while 'case-harden' leans toward creating a callous exterior.
It is very uncommon in everyday speech. You will encounter it mainly in technical/engineering contexts or in literary/formal writing for its figurative effect.
To make the outer surface of a metal (especially steel) extremely hard through a heating and quenching process, while leaving the inner core relatively tough and flexible.
Case-harden is usually technical, formal, figurative/literary in register.
Case-harden: in British English it is pronounced /ˈkeɪsˌhɑːd(ə)n/, and in American English it is pronounced /ˈkeɪsˌhɑːrd(ə)n/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “[to be] case-hardened to something (e.g., case-hardened to criticism)”
Learning
Memory Aids
Mnemonic
Think of a hard outer CASE protecting a softer interior, like an emotionally tough exterior protecting a vulnerable core. The process puts a HARDENed 'case' on the metal/person.
Conceptual Metaphor
PEOPLE ARE METALS / EXPERIENCES ARE PHYSICAL PROCESSES (Hardening a person is like hardening metal; exposure to hardship is like exposure to heat and chemicals).
Practice
Quiz
What is the PRIMARY meaning of 'case-harden'?