knock together

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knock together (third-person singular simple present knocks together, present participle knocking together, simple past and past participle knocked together)

1. (idiomatic) To assemble something quickly; to knock up.

   I'll just knock together a quick demo.

2. (also figurative) To come together, as if in contact.
   • 2023 April 5, Philip Haigh, “Comment: Pay deal a positive result”, in RAIL, number 980, page 3:

     This has all the hallmarks of a disagreement that needs some heads knocking together. It's not in passenger interests for company and union to be arguing like this.

• cobble together
• jury-rig