From Wiktionary, the free dictionary
Deverbal from knock up
knock -up plural knock-ups
( sports ) practice session before a tennis match.
1932 American Lawn Tennis , volume 26 , page 72 :In the way of friendly knockups I played at times with both the Renshaws and Lawford, but at that time there is no doubt that they were better than I was.
Something constructed shoddily or hastily.
2000 Jonathan Kellerman , Monster , page 47 :One of those unadorned late-fifties hillside knockups posing as intentionally contemporary but really the product of a tight construction budget.
( slang ) pregnancy .
2016 Back To The Center , page 54 :When will we wake up? I see young girls pregnant and young boys adding up their “knock-ups ” like a scorecard at a mob gambling venue.
