[English Etymology] *keue- "to swell, hole, vault"

 *keue- "to swell, vault, hole"


Old French cave "a cave, vault, cellar" (12c.)
     Latin cavea "hollow" (place)
                   cavus "hollow"(adj)


Latin cumulatus "heaped, increased, augmented"
             cumulare "to heap"
                 cumulus "mound, heap" 


Latin accumulatus
            accumulare "to heap up, amass" =ad + cumulare