The phrase "a spare post" is correct and usable in written English.
It can be used when referring to an additional or backup post, such as in a blog, social media, or a physical structure.
Example: "In case the main post doesn't go live, I have a spare post ready to publish."
Alternatives: "an extra post" or "a backup post".
A sprawlingly detailed chronicle of family life turns suddenly into a spare, post-apocalyptic diary of collapse, which ends with the Israeli prime minister's rallying call to the men of the Jewish diaspora to return "home".
The variations on the builder's spare post-war architectural themes are astonishing.
In cinema, the main factors seem to be a new awareness of the diversity of her work beyond the Ripley series, and the latterly acquired potential for period nostalgia – although her writing is spare, post-Hitchcock film adaptations have been visually gorgeous, juxtaposing nasty people with lovely backdrops, such as The Two Faces of January's 1960s Athens.
The Internet has made it possible for just about anyone with a spare room to post a listing.
The Internet has made it ever easier for travelers to search for vacation rentals across the globe, but at the same time it has also made it possible for just about anyone with a spare room to post a listing.
Barnett was a spare part by the Knicks' second title, having surrendered his backcourt post to Earl Monroe, with Dean Meminger as the third guard.
A spare part may have several vendors.
Next time you've got a spare 30 seconds post-sandwich, please fill out the form below.
(By then, we'll likely be spared post-lockout or strike talk of anther Favre comeback, but that Hyundai "MVP 2020" ad he was in is getting less and less funny every day).
Make sure your neighbors have a spare key and your mother's phone number posted on the 'fridge.
I promised I'd post an update once I'd gotten a spare unit and tried some things out.
