To put together, fabricate, or assemble, particularly if done hastily or temporarily
“Well then, we'll just have to quickly knock up a log cabin!”
To make (someone) pregnant
“One of my brothers did manage to knock up his girlfriend before he married her, but that was after he got out of college.”
To emerge, or cause to emerge, from sleep
“Knock me up in the morning, would you?”
To warm up before a game, typically by hitting a ball back and forth
“The players have a couple of minutes to knock up before the match starts.”
To bring into existence
To attain or register (a specified time, distance, or speed)
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