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to knock up

to knock up

35 9.9
To make a woman pregnant
  • phrasal verb
  • /nɑk ʌp/
  • NSFW
translation icon : dejar embarazada
  • He was surprised when he found out he had knocked up his girlfriend during their last vacation.
  • get knocked up
  • a girl was knocked up
  • knock up a girlfriend

Well, Chrysanthemum or one of her kids gets knocked up during the campaign, right?

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Examples

  • I never did believe that story about you being knocked up anyway.

  • She's knocked up.

  • Her and that dude ended up getting knocked up while she was still in high school.

  • Who knocked up your sister?

  • I had let myself, as my mother would say, get "knocked up and abandoned."

    Academic text (2001)
  • For she was rough and ready, and nothing surprised her more than getting knocked up with a baby.

    Fiction book (1995)
  • "Girls are always going to get knocked up," Angie said.

    Fiction book (1993)
  • You're the bastard who knocked me up and left me.

  • Who knew we'd be able to capitalize on me getting knocked up?

  • Sylvia says don't spread it around, but two of the nine cancan girls are knocked up.

    Fiction book (1992)

Synonyms

to impregnate
vsto knock up
32 7.2

To make a woman, female animal, or an egg start to grow a baby

is informal slang limited to human women rather than animals or eggs
to knock someone up
vsto knock up
  • NSFW
15 9.9

To make someone pregnant, said informally

is the same meaning but includes the object explicitly in phrasing
to bang up
vsto knock up
  • Offensive
9.9

Make someone pregnant, usually by accident

implies pregnancy without stressing accident or surprise

Surface Forms

knock up infinitive
knocking up present participle
knocks up third person singular
knocked up past
knocked up past participle

Morphology

knock + up

The meaning 'to make or prepare something quickly' is only partially derivable: the particle 'up' often signals completion/production and 'knock' can imply a quick action, but the precise sense of improvisational quick preparation is idiomatic and not directly predictable from the constituents. Additionally, the strong alternative meaning (particularly in American English) 'to impregnate' creates ambiguity for learners, reducing overall transparency.

Etymology

Knock up may come from old slang where knock meant a quick sexual act and up showed it was finished, giving a sharp image of an action that can lead to a baby. That's why the phrase means 'to make a woman pregnant'.