The term “beaching off” is not commonly used in standard English, but it may refer to a few different concepts depending on the context. Here are a couple of interpretations:
Nautical Context: “Beaching” typically refers to the act of bringing a boat or ship onto the shore or beach, often to unload cargo, allow passengers to disembark, or perform maintenance. “Beaching off” could imply the process of moving away from the beach after being beached or possibly the act of beaching something but with a slight nuance of not fully engaging with the shore.
Slang or Colloquial Use: In some informal contexts, “beaching off” could be a variation of another phrase, perhaps used to describe someone who is lounging at the beach or taking a break by the water. This might not be a widely recognized phrase, but slang can evolve and differ by region.
If you have a specific context in mind where you’ve encountered the term, I can provide a more tailored explanation!