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1. To build something hastily or temporarily using various disparate pieces or parts. A noun or pronoun can be used between "patch" and "together." My wife is an amazing tinkerer. She patched together a working robot just out of spare parts she found lying around our garage!
2. To mend, repair, or service something to the point of being functional or whole again, especially temporarily, typically by adding material to cover or connect broken or missing parts. A noun or pronoun can be used between "patch" and "together." The car broke down in the middle of the interstate, so I had to patch it together with what little I had available just so I could get it to a service station. Will you see if you can patch this pipe together while we wait for the repairman?
3. To conceive of something very hastily or haphazardly. A noun or pronoun can be used between "patch" and "together." I had to patch together a story for the boss about why I was late again. I had forgotten to bring my notes for the presentation, so I just patched something together at the last minute
patch something together (with something)
to use something to repair something hastily or temporarily. I think I can patch the exhaust pipe together with some wire. See if you can patch this engine together well enough to run for a few more hours.