horsepower
B2Technical, informal
Definition
Meaning
A unit for measuring the power of an engine, equal to 550 foot-pounds per second (about 750 watts).
Informally used to denote impressive power, capacity, or force, often metaphorically.
Linguistics
Semantic Notes
Primarily a technical measurement term in engineering and automotive contexts, but commonly used in informal comparisons to describe strength or energy.
Dialectal Variation
British vs American Usage
Differences
The definition (1 hp = 550 ft·lb/s) is standard in both. In the UK, 'brake horsepower' (bhp) is a common specification for vehicle power. In the US, 'SAE net horsepower' is the standard automotive figure.
Connotations
Both share connotations of mechanical power, performance, and strength. In marketing, higher numbers are associated with prestige.
Frequency
Equally frequent in automotive and engineering contexts in both varieties.
Vocabulary
Collocations
Grammar
Valency Patterns
[Number] horsepowerhorsepower of [Number][Verb] [Number] horsepowerVocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “[No common idioms, but phrases] 'all horsepower and no handling', 'throwing horsepower at the problem'”
Usage
Context Usage
Business
Used in automotive marketing, specifications, and comparisons of performance.
Academic
Used in engineering, physics, and automotive technology papers.
Everyday
Common in car reviews, casual talk about vehicle performance, and metaphorical use for strength.
Technical
Precise unit of measurement in mechanical and automotive engineering.
Examples
By Part of Speech
adjective
British English
- The new high-horsepower variants are selling well.
- It's a low-horsepower, high-economy model.
American English
- They offer a high-horsepower upgrade package.
- It's a bare-horsepower calculation, ignoring efficiency.
Examples
By CEFR Level
- This car has a lot of horsepower.
- The tractor's engine is powerful.
- The new sports car produces over 500 horsepower.
- How much horsepower does your motorbike have?
- The engineers managed to increase the engine's horsepower by 15% without increasing its size.
- She argued that the project needed more intellectual horsepower, not just more people.
- While torque determines initial acceleration, horsepower is paramount for achieving high top speeds.
- The debate was a stark clash of political horsepower versus grassroots mobilisation.
Learning
Memory Aids
Mnemonic
Think of a HORSE's POWER. The original definition was based on how much work a draft horse could do. The car engine has the 'power of many horses'.
Conceptual Metaphor
POWER IS PHYSICAL FORCE (The engine has force like a team of horses).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'лошадиная сила' (direct translation, but singular in Russian).
- Avoid literal back-translation like 'power of a horse'.
- Remember it is a countable unit: '300 horsepowers' is incorrect; it's always '300 horsepower'.
Common Mistakes
- Adding an 's' for plural ('horsepowers').
- Confusing 'horsepower' (power) with 'torque' (rotational force).
- Using it as an adjective without a hyphen (e.g., 'a horsepower engine' should be 'a horsepower engine' or 'a high-horsepower engine').
Practice
Quiz
Which of the following is a standard technical synonym for 'horsepower' in automotive contexts?
FAQ
Frequently Asked Questions
It is an uncountable noun. We say '300 horsepower', not '300 horsepowers'.
Horsepower is a measure of power (work done over time). Torque is a measure of rotational force. High torque gives strong acceleration from a stop; high horsepower allows for higher top speed.
Yes, but only metaphorically in informal contexts, e.g., 'We need more brainpower/horsepower on this project.'
It was coined by engineer James Watt in the 18th century to compare the output of steam engines to the power of draft horses, helping market his new technology.