Just thought you might like to know the origin of 'knocked up' - it also means to impregnate here as well as to call upon someone, and it depends on the context as to which we mean when we say it.
It originally came from times when we didn't have alarm clocks, a couple of hundred years ago and most men worked in factories and mines and they had to get up at about 4am.
In those days you were fired immediately if you were late, so most people used to pay a 'knocker uper' to wake them up in the morning - which is a person who throws peas at the window to wake you up, hence knocking you up.
Professional knocker up's were still employed in the UK until the early 20th century so the term still means to call upon or to wake up, but in more recent years it has become more of a sexual connotation so kids or teenagers would laugh if you used that term.
It is mainly people aged about 50 that still use it to mean call upon.
