TgJ Is34:7 :וְתִרוֵי אְרַעהוֹן מִדַמהוֹן וְעַפרְהוֹן מִתַרבְהוֹן יִדְהַן‏ : the ground will be satiated with their blood and their dirt full of grease from their fat
See the entire entry for dhn vb. to become fat