To impregnate, especially out of wedlock. See knocked up.
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.
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.
To put together, fabricate, or assemble, particularly if done hastily or temporarily. See also knock together.
To make even at the edges, or to shape into book form.