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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!
Make or assemble quickly or carelessly, as in We knocked together the bookcases in about half an hour. [Late 1800s]
1. To strike some pair or set of things against each other abruptly: We didn't have a drum to keep the beat, so I knocked a couple of sticks together. The guide showed us how to start a fire by knocking together certain kinds of rock.
2. To collide, especially repeatedly or glancingly: The two boats knocked together in the narrow channel.
3. To make, assemble, or build something quickly or carelessly: The editor knocked an article together for the front page. I knocked together a makeshift table out of some old lumber.