"Cobble up" is a phrasal verb used to mean making something quickly or putting something together in a haphazard way. There are multiple synonyms for this word, including "patch together," "rig up," "jury-rig," "make do," "throw together," "assemble hastily," and "slap together." All of these synonyms have a similar meaning and are used in situations where the result doesn't need to be perfect but needs to be functional in a short amount of time. It's important to note that while "cobble up" can have a negative connotation, the use of these synonyms can convey resourcefulness and creativity in solving a problem quickly.