What does the notation 【方】 mean in a Chinese dictionary? In a dictionary entry reading…

saggy adj.【方】下垂的；垂曲的；中陷的。

…, what does the notation 【方】 mean?
(Other examples of this notation that I understand include “【美俗】” (American slang), “【解剖】” (anatomy), and “【數學】” (mathematics).)
I’d prefer source material in an answer.
【方】

Is short for 方言.
方言 is defined by mdbg as:

topolect / dialect


Why saggy is considered topolectical or dialectical, though, is beyond me.