knock up /nɒk ʌp/verb 8knock-up noun 3forms 4 verb8 •(informal) To put together, fabricate, or assemble, particularly if done hastily or temporarily.I'll just knock up a quick demo for the sales presentation. •(slang) To impregnate, especially out of wedlock or accidentally. See knocked up.I guess his summer plans are shot now that he knocked his girlfriend up. •To gently hit the ball back and forth before a tennis match, as practice or warm-up, and to gauge the state of the playing surface, lighting, etc. See knock-up.The Tennis & Rackets Association - Tournament Rules Official Knock up: if the players knock up together a maximum of five minutes shall be permitted; if they knock up separately each player shall be permitted to knock up for a maximum of five minutes. •(UK) To awaken (someone) as by knocking at the door; rouse; call; summon; also, to go door-to-door on election day to persuade a candidate's supporters to go to the polling station and vote. See also knocker up.However, by dint of beating about a little in the dark, and now and then knocking up a peaceable inhabitant to inquire the way, we at last came to something which there was no mistaking. — 1851 •(old-fashioned) To exhaust; wear out; tire out; to fatigue until unable to do more.‘Now, mamma,’ he said, when he went out, ‘take notice, you are not to knock up your god-daughter with gossip,’ [...] — 1835 •(old-fashioned) To become exhausted or worn out; to fail of strength; to become wearied, as with labor; to give out.[…] the horses were beginning to knock up under the fatigue of such severe service […] — 1856 •To make even at the edges, or to shape into book form.to knock up printed sheets •To straighten up a stack of paper. knock-up noun3 •A short practice session before a tennis match.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. — 1932 •(slang) A pregnancy.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. — 2016 •Something constructed shoddily or hastily.One of those unadorned late-fifties hillside knockups posing as intentionally contemporary but really the product of a tight construction budget. — 2000 formsknocked up · knocking up · knocks up · knock-ups