What does the yiddish word shachan mean?

"Shachan" (שַׁחַן) is not a common Yiddish word. It's possible that you are thinking of a similar-sounding word or have misheard it.

Could you clarify what you meant?

Perhaps you're thinking of:

* "Shachen" (שַחַן) which is Hebrew and refers to a "table" or "counter".

* "Shach" (שַׁח) which is Hebrew and refers to "check" in chess.

* "Shach" (שַׁח), which is also Hebrew and means "black".

Please provide more context or details about where you encountered this word. I'd be happy to help you further.