Quoting Commentary for I Kings 21:13

לדשנו means TO REMOVE ITS ASHES in them. That is exactly as Onkelos translated it: למספי קטמה, to remove the ashes into them. For although in its primary sense דַּשֵּׁן would mean to cover with ashes, it has also the meaning of removing the ashes, for there are in the Hebrew language certain expressions with the peculiarity that the same word changes in meaning so as to be used to denote both “construction” and “destruction,” (having a positive and a negative meaning). Examples are: (Psalms 80:10) “and didst cause it to take deep root (ותשרש)”; (Job 5:3) “I have seen the foolish taking root (משריש),” whilst we have its opposite (negative) meaning in, (Job 31:12) “and thou wouldst root out (תשרש) all my increase.” Similar to it is, (Isaiah 17:6) “in the utmost fruitful branches (בסעיפיה),” and its opposite, (Isaiah 10:33) “The Lord of hosts shall מסעף”, i. e. shall lop off the branches thereof. Similar to it is also (Jeremiah 50:17) “And this last person עִצְּמוֹ” — “has broken his bones” although the primary meaning of עצם is to be strongboned. Similar to it is, (1 Kings 21:13) “and stoned him with stones (ויסקלהו)” i. e. heaped up stones above him, and its opposite is, (Isaiah 62:10) “סקלו the stones” — i. e. remove its stones; and so, too, (Isaiah 5:2) “And he fenced it and gathered out the stones thereof (ויסקלהו).” Thus here, also, לדשנו means to remove its ashes. In 0. F. à discendrer.

ויקוב, ויקלל, the Torah does not use the expression ויברך which is traditionally used someone who curses the name of G-d, as for instance in Kings I 21,13, where Navot had been accused (falsely) of cursing the King and G-d, in order for the King to have a pretext to have him executed for not selling him his vineyard. It uses the word: ויקלל, instead, which refers to someone cursing without using the tetragram as the Lord’s name, a sin not punishable by the death penalty. (Sifra)