ball cock
C1Technical, Plumbing, Informal (when discussing household repairs).
Definition
Meaning
A valve in a water tank (like a toilet cistern) controlled by a floating ball that opens or closes the water supply.
Specifically refers to the component of a flushing mechanism that regulates water level. Sometimes used as a compound noun for the entire float valve assembly. No other common extended meanings exist.
Linguistics
Semantic Notes
This is a technical term for a specific mechanical device. The term is composed of two common nouns ('ball' + 'cock'), but the combination is a fixed technical compound. The 'cock' here is an old term for a tap or valve (cf. stopcock).
Dialectal Variation
British vs American Usage
Differences
In the US, the term 'ballcock' (often as one word) or 'fill valve' is more common. In the UK, 'ball valve' or 'float valve' are also used, but 'ball cock' is still recognized.
Connotations
The term can cause unintended humor or embarrassment for learners due to the second word's vulgar slang meaning, especially in American English. In British English, 'cock' as 'valve' is somewhat archaic but preserved in technical terms.
Frequency
Low frequency in general discourse. Higher frequency in DIY/plumbing contexts. 'Fill valve' is becoming the more standard technical term internationally to avoid the slang connotation.
Vocabulary
Collocations
Grammar
Valency Patterns
The [NOUN] has a faulty ball cock.I need to [VERB] the ball cock.The ball cock [VERB] the water flow.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “None. It is a technical term.”
Usage
Context Usage
Business
Rare, unless in the plumbing supply trade.
Academic
Rare, possibly in engineering or design contexts describing fluid control mechanisms.
Everyday
Used when discussing toilet or water tank repairs. Often replaced by more descriptive phrases like 'the thing that stops the toilet filling' to avoid the word 'cock'.
Technical
Standard, precise term in plumbing manuals, parts catalogues, and DIY guides, though 'fill valve' is increasingly preferred.
Examples
By Part of Speech
verb
British English
- The valve needs ball-cocking properly. (Rare/constructed)
American English
- The plumber will ballcock the new assembly. (Rare/constructed)
adjective
British English
- The ball-cock mechanism is ancient. (Hyphenated attributive use)
American English
- It's a standard ballcock unit. (Compound attributive use)
Examples
By CEFR Level
- The toilet keeps running; I think the ball cock is broken.
- My dad showed me how the ball cock works in the water tank.
- A worn washer in the ball cock can cause a constant, quiet trickle of water into the pan.
- Before you call a plumber, check if the ball cock is stuck in the open position.
- The modern fill valve has largely superseded the traditional brass ball cock and lever arm due to its reliability and ease of adjustment.
- Hydraulic engineers noted the ball cock's design exemplifies a simple yet effective application of buoyancy for fluid regulation.
Learning
Memory Aids
Mnemonic
Imagine a football (ball) sitting on a tap (cock) inside the toilet tank. When the ball floats up, it turns the tap off.
Conceptual Metaphor
CONTROL IS UP/DOWN (The ball rising = closing the valve; lowering = opening the valve).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not translate 'cock' as 'петух'. This is a 'шаровой клапан' or 'поплавковый клапан'.
- Avoid using the direct cognate 'кок' as it is meaningless in this context.
- The phrase is a technical compound; translating word-for-word will sound absurd.
Common Mistakes
- Writing as 'ball-cock' or 'ballcock' inconsistently.
- Using it in non-plumbing contexts.
- Mispronouncing 'cock' with a vowel that is too short or long, altering the meaning.
- Confusing it with 'ballcock' as a surname.
Practice
Quiz
In which context would you most likely encounter the term 'ball cock'?
FAQ
Frequently Asked Questions
It is a standard technical term in plumbing. However, because 'cock' is also common vulgar slang, the term can cause amusement or embarrassment, especially in American English. In professional contexts, it is neutral.
'Fill valve' is the most common modern and neutral equivalent. You will also see 'float valve' or 'ball valve'.
Both 'ball cock' (two words) and 'ballcock' (one word) are used. Dictionaries often list 'ballcock' as the headword, but the two-word form is still common in writing.
You can, but be aware of the potential for misunderstanding due to the slang meaning of 'cock'. In casual talk, people often use descriptive phrases like 'the toilet's float valve' or 'the thingamajig in the tank' instead.