To dig up is to bring something to the surface — or to uncover an old secret. Both involve going down for it.
The literal sense covers roads, gardens and archaeology, so digging up a pipe means excavating to reach it. The figurative sense belongs to journalism and to arguments, since digging up somebody's past is a deliberate act, and digging up old grievances is what nobody wants at a family gathering. It splits round an object. Unearth is the formal single word.
Practised in Phrasal Verbs, A Man Called Ove
First appears in chapter 4 of A Man Called Ove.
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