'Curse' in the Bible

Now you have with you Shimei, the son of Gera the Benjamite of Bahurim, who put a bitter curse on me on the day when I went to Mahanaim; but he came down to see me at Jordan, and I gave him my oath by the Lord, saying, I will not put you to death by the sword.

And he said to him, These are the words of the Lord: Because you have let go from your hands the man whom I had put to the curse, your life will be taken for his life, and your people for his people.