BT Naz 50b(12) :כגון דבהדי דמרתח ליה סליק עמוד לפומי׳ דמנ̇ה̇ וקרש‏ : as in the case that it is boiling and the column (of fat) went up to the mouth of the vessel and congealed
See the entire entry for qrš#2 vb. to be cold