"paving stone; worn, rounded stone," c. 1600, earlier cobblestone, probably a diminutive of cob in some sense. The verb in this sense is from 1690s. Related: Cobbled; cobbling.
"to mend clumsily," late 15c., perhaps a back-formation from cobbler (n.1), or from cob, via a notion of lumps. Related: Cobbled; cobbling.
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