From pa'ar; properly, illuminated, i.e. A glow; as noun, a flush (of anxiety) -- blackness.
see HEBREW pa'ar
H6289. parur
מָּארוּר noun [masculine] meaning dubious; only פ ׳קִבְּצוּ Nahum 2:11; Joel 2:6; Thes, all faces gather a glow (glow with dread, from assumed √ פאר), so We Now; AE Hi and others gather in (their) beauty (√ I. פאר; grow pale); Vrss AV gather blackness (from מָּרוּר a pot !), see Dr; all very uncertain.