Deverbal from knock up.
knock-up (plural knock-ups)
- (sports) A short 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) A pregnancy.
2016, Veronica Valles, 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.