knock up = knock on the door and wake up somebody
examples:
- Knock me up at seven, will you?
- Mother knocked us up very early.
- I 'll knock you up around five.
- A neighbour knocked us up in the middle of the night.
- What time do you want me to knock you up?
- Two police officers knocked us up at night to ask questions about the crime.
- Could you please knock me up at seven? I 've got to catch the eight o' clock train.
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