knock up
Low-medium (regional/vulgar meanings limit usage).Informal; the US meaning is vulgar slang.
Definition
Meaning
To awaken or summon someone by knocking (UK); to make pregnant (US slang).
In British English: to hastily create or assemble something; in sports: a practice match or warm-up; in US English: to become pregnant (vulgar).
Linguistics
Semantic Notes
A phrasal verb with highly region-specific and potentially offensive meanings. Context is crucial for interpretation.
Dialectal Variation
British vs American Usage
Differences
In UK English, it's primarily literal (to knock to awaken) or informal (to assemble quickly). In US English, it's overwhelmingly a vulgar term for making someone pregnant.
Connotations
UK: informal/neutral. US: vulgar, offensive if used in mixed/polite company.
Frequency
More frequent in UK English in literal/constructive contexts. US usage is common in slang but avoided in formal/public speech.
Vocabulary
Collocations
Grammar
Valency Patterns
[subject] knock [object] up[subject] be knocked up (US)Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “Knock up a quick meal.”
- “Have a knock-up before the match.”
Usage
Context Usage
Business
Avoid completely due to potential for misunderstanding/offence.
Academic
Not used.
Everyday
Caution needed; context must be clear. Common in UK sports (tennis).
Technical
Not applicable.
Examples
By Part of Speech
verb
British English
- I'll knock him up at seven for the meeting.
- He knocked up a shed in the garden over the weekend.
American English
- He knocked her up and then left town.
adverb
British English
- We played tennis knock-up for an hour.
American English
- The phrase is not used adverbially.
adjective
British English
- It was just a knock-up game, nothing serious.
- She's a bit knocked up after the long journey.
American English
- She found out she was knocked up last month.
Examples
By CEFR Level
- Please knock me up at eight o'clock tomorrow. (UK)
- The builders knocked up a temporary fence. (UK)
- They had a quick knock-up before the tennis tournament. (UK)
- The slang meaning is a notorious 'false friend' between British and American English.
Learning
Memory Aids
Mnemonic
KNOCK to wake UP (UK) vs. KNOCK so someone ends UP pregnant (US).
Conceptual Metaphor
PROCREATION AS A PHYSICAL IMPACT (US); CREATION AS HASTY ASSEMBLY (UK).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Direct translation "стучать вверх" is nonsensical. The US meaning aligns with грубо "залететь" or "трахнуть до беременности". The UK meaning does not map directly to a single Russian phrase.
Common Mistakes
- Using the US meaning in a UK context (highly offensive). Assuming it's universally understood as 'awaken'. Using it in any formal or international setting without extreme contextual clarity.
Practice
Quiz
In British English, what is a 'knock-up' in tennis?
FAQ
Frequently Asked Questions
In American English, it is considered vulgar and offensive in polite conversation. In British English, the literal and informal meanings are not offensive, but the US meaning is understood and can cause confusion or offence if misinterpreted.
Absolutely not. The potential for severe misinterpretation and offence is too high. Use precise, neutral alternatives like 'awaken', 'assemble quickly', or 'prepare hastily'.
The safest way is to avoid it entirely unless you are certain of your audience's dialect and the clear, unambiguous context (e.g., discussing UK tennis).
Yes: 'whip up', 'throw together', 'rustle up', 'put together hastily' are all good, regionally-neutral alternatives.