cobble up

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cobble up

To form, assemble, or complete something very quickly, especially in a rough, sloppy, or careless manner. A noun or pronoun can be used between "cobble" and "up." 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.
See also: cobble, up
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

cobble something up

 and 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.
See also: cobble, up
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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