BT Šab 110b(44) :כי קם איחמם ונפל מיניה פורתא פורתא‏ : when (the garment) was heated up (by the fever), it disintegrated [lit. fell off him] bit by bit
See the entire entry for ḥmm vb. to be hot

BT Šab 110b(44) :ונפל מיניה פורתא פורתא‏ : (the garment) disintegrated [lit. fell apart from him bit by bit]
See the entire entry for npl vb. to fall; befall

BT Šab 110b(44) :כי קם איחמם ונפל מיניה פורתא פורתא‏ : as he stayed warm, it left him bit by bit
See the entire entry for purtā n.m. portion, small amount