Definitions
WordNet 3.0
- v. make pregnant
Examples
“Being loth to knock up the hotel people at so late an hour — for you must understand, sir, that we did not get to Slepe Rock until after midnight — we essayed the garage attached to, and/or erected upon, the yard where the lorries and motor coaches pull in during the daytime.’”
“Class Kenneth Cordell sneaked in through the window, not once, but enough times to make damn sure and knock up one Iris Ann”
Lists
These user-created lists contain the word ‘knock up’.
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UK - slang
fanny, nick, mufti, siphon, mug, smashing, butcher, stick up, knocker, porridge, tit, punter and 208 more...
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discoveries
These are lexical items new to me that I've discovered in actual use (i.e. not in dictionaries, lists, or this site).
Looking back over this list, I haven't the slightest idea what mos...haymow, hawsepipe, stridor, bariatric, autotelic, apotropaic, cyanotype, tourelle, autobody, zudecca, stifado, corbeille and 1073 more...
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pax australiana
first in, best dr..., chalk and cheese, chuck a sickie, banana bender, sandgroper, croweater, budgie smuggler, bludge, bathers, swimmers, bogan, buck's night and 73 more...
Tweets
Looking for tweets for knock up.

emil in Australian slang, means "to whip up (a dish)" Jul 2, 2009
johnmperry also (v) to wake someone up (early). See knocker-up Jul 17, 2008
johnmperry also (v.t.) to impregnate (7th definition, = to make pregnant) Jul 17, 2008
qroqqa also v.i. practise before a tennis game Jul 17, 2008