knock up
phrasal verb.to wake someone by knocking on their door — often used in informal British English.
phrasal verb.to wake someone by knocking; also used informally to mean 'to create or produce something quickly' (e.g., 'knock up a report'). Marked British informal / slang.
“He knocked up his friend at 7 AM.”
“She had to knock up her roommate because they were late for work.”
“The journalist knocked up a detailed report in under an hour, impressing the editor.”
typically followed by a person or thing being created or woken.
contrast with 'wake up' (more direct) and 'produce' (formal alternative); note the informal use of 'knock up' meaning 'create quickly' is limited to British English.
the phrasal verb requires an object to indicate who or what is being knocked up