So I was hip deep in an edit and there it was - right in the middle of the paragraph 'letting off steam'. In a sci-fi setting. OK so we still use it, even today, in an era when most probably don't know about its origins or the technology that underlies the phrase. By contrast, the phrase 'coals to Newcastle' - meaning taking something to somewhere there is already a lot of it - was commonly used all over the UK, for centuries, now since those coalfields closed, most people under 30 have never even heard it.
Share your examples of any consciously updated phrases of this sort you have used in your writing. Oh and if anyone has an update for 'letting off steam' do please share that too