1
general::
Phrase(s): knock someone up
Inf. to make a woman pregnant. (See also knocked up.) • They say it was Willie who knocked her up. • He did not knock up Sue. I did.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Make pregnant, as in The young girl said she was afraid of getting knocked up. [Slang; early 1800s] 1. 2. Injure or damage, as in This coffee table got all knocked up in the moving van.
American Heritage Idioms