BT Ber 56b(3) :לא מחילנא ליה עד דאיצטליק רישיה מגופיה‏ : I shall not forgive him until his head is split lengthwise from his body
See the entire entry for ḥll vb. to cleanse

BT Ber 56b(3) :לא מחילנא ליה‏ : I will not pardon him
See the entire entry for ḥll#3 vb. to split; relinquish