preserved in aspic en · ADJ
Meanings
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(idiomatic, not-comparable) Unchanged, especially if contrary to expectation.
He described the service as ‘preserved in aspic, speaking with the plummy tones of a Britain that scarcely existed any longer’.
Johnston, G., Robertson, E. (2019). BBC World Service: Overseas Broadcasting, 1932–2018. Germany: Palgrave Macmillan UK. p.285