english
1
general::
Phrase(s): knock something together to assemble something hastily. • I knocked this model together so you could get a general idea of what I had in mind. • See if you can knock together a quick snack. • This thing has just been knocked together!
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Make or assemble quickly or carelessly, as in We knocked together the bookcases in about half an hour. [Late 1800s]
American Heritage Idioms