Paved with cobblestones; repaired in a rough or temporary way; hastily put together.
From cobble (to pave with cobbles or to repair shoes), with past tense suffix -ed. The 'rough repair' meaning comes from the association with cobblers doing makeshift fixes.
The phrase 'cobbled together' means hastily assembled, which comes from cobblers literally throwing repair patches on shoes—the original quick fix!
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