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Related to cobble up: cobble together
cobble (something) up
To assemble or complete something quickly and/or sloppily. The incoherent argument in your paper tells me that you cobbled it up in study hall. Look at that rickety bike—it looks like he just cobbled it up with old junk from his basement.
cobble something upand cobble something together
to make something or put something together hastily or carelessly. Who cobbled this thing up? Take it apart and start over. The kids cobbled up their model planes badly. It looks like you cobbled together that report just last night.