We’re just about to sit down ourselves.
Just this hint: Ship High In Transit
We have a ways to go — LoM’s asleep.
That supposed word origin is very dubious. Very few words have entered English from acronymic beginnings. Posh is one, and of course radar.
However, there are too many related referents for that to be an accurate rendition. Shire Reave, the origin for Sheriff, seems to be related, as does share, shore, and others.
Actually, it has lost a sound, the original being more like ski, such as skat or scat.
A word I was examining recently, blatherskite, also has a connection.
Some of my inferences may be incorrect. This was all done from memory.