siphon
C1Neutral to formal; technical in its primary sense.
Definition
Meaning
A tube used to move a liquid from a higher container to a lower one by atmospheric pressure, with the tube going over the top edge of the upper container.
To draw off or transfer (something, especially liquid, money, or a resource) gradually, often in a hidden or improper way.
Linguistics
Semantic Notes
As a verb, it often implies a transfer that is unauthorized, secretive, or exploitative, especially with non-liquid entities (e.g., money, data).
Dialectal Variation
British vs American Usage
Differences
The primary spelling is 'siphon' in both. 'Syphon' is a less common, chiefly British variant spelling for both noun and verb.
Connotations
Identical.
Frequency
The spelling 'siphon' is dominant in American English and increasingly so in British English. 'Syphon' is recognized but less frequent.
Vocabulary
Collocations
Grammar
Valency Patterns
[Verb] siphon something off/from/out of something[Verb] siphon something into/out of something[Noun] a siphon from X to YVocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “Siphon off (the cream/profits/resources)”
Usage
Context Usage
Business
Referring to the illegal or unethical diversion of company assets or profits.
Academic
Used in physics/engineering contexts to describe fluid dynamics; in social sciences, to describe resource transfer.
Everyday
Most commonly used for transferring petrol/fuel or draining water from a fish tank.
Technical
A precise term in fluid mechanics for a pipe based on pressure differentials.
Examples
By Part of Speech
verb
British English
- He used a tube to siphon the excess water out of the pond.
- The manager was accused of siphoning off client deposits.
American English
- They had to siphon gas from the truck after it ran out.
- The scheme was designed to siphon profits into offshore accounts.
adverb
British English
- Not typically used as an adverb.
American English
- Not typically used as an adverb.
adjective
British English
- The siphon mechanism was clogged with debris.
- They installed a new siphon hose for the aquarium.
American English
- The siphon action started once the tube was filled.
- A siphon pump is essential for this task.
Examples
By CEFR Level
- We need a tube to siphon the water from the bucket.
- The fish tank has a small siphon for cleaning.
- The investigation revealed he had siphoned off thousands from the charity.
- Using a simple siphon, you can transfer liquid without a pump.
- Corrupt officials systematically siphoned state resources into private holdings.
- The economic policy inadvertently siphoned capital away from domestic manufacturing.
Learning
Memory Aids
Mnemonic
Think of a 'SIGH of relief' as you watch water flow DOWN from a higher tank through a 'SIPHON' tube.
Conceptual Metaphor
MOVING RESOURCES IS DRAINING A CONTAINER (e.g., 'The corrupt official siphoned public funds into his account').
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Не переводить как 'сифон' (газированная вода) в бытовом контексте.
- Глагол 'to siphon off funds' часто соответствует 'откачивать, перекачивать (средства)', а не просто 'переводить'.
Common Mistakes
- Misspelling as 'ciphone' or 'syphone'.
- Using it without 'off' when the meaning is illicit transfer (e.g., 'He siphoned company money' is less idiomatic than 'He siphoned off company money').
Practice
Quiz
Which of the following is the LEAST likely meaning of 'siphon' as a verb in a financial news report?
FAQ
Frequently Asked Questions
Yes, 'syphon' is an accepted variant, particularly in British English, but 'siphon' is the more common and recommended spelling globally.
Yes, especially as a verb ('siphon off'). It is commonly used metaphorically for money, data, energy, or other resources being diverted or drained away.
A siphon works due to atmospheric pressure and gravity. Once the tube is filled with liquid and the downstream end is lower than the surface of the source liquid, gravity pulls the liquid down, creating a pressure differential that continues the flow.
A pump uses mechanical force to move a fluid. A siphon relies solely on gravity and atmospheric pressure once initiated; it has no moving parts.