stiffen
B2Neutral to formal. Common in written English, technical/engineering contexts, and descriptive prose.
Definition
Meaning
to become or make something rigid, firm, or less flexible; to make or become stronger, stricter, or more determined
To make a substance thicker or more viscous; to become more formal, tense, or resistant; to reinforce or strengthen something structurally or morally.
Linguistics
Semantic Notes
Often implies a change of state from flexible/soft to rigid/firm. Can describe physical materials, bodily posture, attitudes, rules, or resistance. When describing people, it often connotes preparation, resolve, or alarm.
Dialectal Variation
British vs American Usage
Differences
No significant difference in core meaning. Slightly more frequent in British English in the phrase 'stiffen one's resolve'.
Connotations
In both varieties, can carry a slight negative connotation when describing bureaucratic processes ('stiffen regulations') or a positive one when describing character ('stiffen one's spine').
Frequency
Moderately low frequency in both. More common in written genres than spontaneous speech.
Vocabulary
Collocations
Grammar
Valency Patterns
[intransitive]: The jelly will stiffen as it cools.[transitive]: Add cornflour to stiffen the gravy.[intransitive + with]: He stiffened with indignation.[transitive + object]: The new law stiffened the penalty for fraud.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “stiffen one's spine/the sinews”
- “stiffen the upper lip (rare variant of 'keep a stiff upper lip')”
Usage
Context Usage
Business
Used regarding regulations, penalties, or market resistance.
Academic
Used in materials science, sociology (e.g., stiffening social norms), and history.
Everyday
Most common in cooking, DIY, and describing reactions to shock or fear.
Technical
Engineering: stiffening a beam; Medicine: muscle stiffening; Cooking: stiffening egg whites.
Examples
By Part of Speech
verb
British English
- The council voted to stiffen the licensing laws for pubs.
- Her smile didn't waver, but he noticed her shoulders stiffen slightly.
- Whisk the egg whites until they stiffen and form peaks.
American English
- The Senator promised to stiffen penalties for corporate fraud.
- I felt my back stiffen after sitting at the desk all day.
- You'll need to stiffen the frosting with more powdered sugar.
Examples
By CEFR Level
- The cold wind made my fingers stiffen.
- Wait for the glue to stiffen before moving the pieces.
- The government plans to stiffen the laws on air pollution.
- She felt her body stiffen as she heard the strange noise.
- His attitude stiffened considerably after the criticism.
- To make the pavlova, you must stiffen the meringue mixture properly.
- International pressure is likely to stiffen the regime's resistance to reform.
- The fabric is treated with a resin to stiffen it for use in upholstery.
Learning
Memory Aids
Mnemonic
Imagine a STIFF person suddenly becoming even more STIFF-EN. The word itself ends with '-en', a common verb suffix meaning 'to become' (like 'widen', 'darken').
Conceptual Metaphor
RESOLUTION IS RIGIDITY ('stiffen one's resolve'); RESISTANCE IS SOLIDIFICATION ('opposition stiffened'); FEAR IS FREEZING ('he stiffened with terror').
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Not to be confused with 'укреплять' in all contexts. 'Stiffen' emphasizes making rigid, not just strong. For moral strengthening, 'укрепить дух' is close, but 'stiffen' implies a reactive tightening, not gradual development.
- False friend with 'стимулировать' (to stimulate). 'Stiffen' is about restriction or solidification, not encouragement.
Common Mistakes
- Using 'stiffen' for people becoming angry instead of physically tense or resolute. (Incorrect: 'He stiffened with anger' is possible but means his body became rigid, not that he merely became angry).
- Confusing 'stiffen' with 'strengthen'. You stiffen a gel, but strengthen a argument.
- Incorrect particle use: 'stiffen against' is rare; prefer 'stiffen with (emotion)' or 'stiffen in (opposition)'.
Practice
Quiz
In which context is the use of 'stiffen' most appropriate?
FAQ
Frequently Asked Questions
It is neutral but leans toward written and descriptive contexts. It is perfectly acceptable in formal writing but less common in casual conversation than simpler words like 'get stiff' or 'harden'.
Yes. It primarily describes physical rigidity (muscles, materials) but is very commonly used metaphorically for rules, resolve, resistance, and attitudes.
'Harden' implies a more complete and permanent transition to solidity (e.g., concrete hardens). 'Stiffen' often suggests a lesser degree of rigidity, a temporary state, or a process affecting structure rather than entire substance (e.g., starch stiffens fabric; a person stiffens their posture).
Yes, the past participle can be used adjectivally (e.g., 'stiffened cardboard', 'a stiffened attitude'). It functions similarly to other participles like 'hardened' or 'broken'.
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