'Curses' in the Bible

Then King David reached Bahurim. There a man from Saul's extended family named Shimei son of Gera came out, yelling curses as he approached.

As he yelled curses, Shimei said, "Leave! Leave! You man of bloodshed, you wicked man!

But the king said, "What do we have in common, you sons of Zeruiah? If he curses because the Lord has said to him, 'Curse David!', who can say to him, 'Why have you done this?'"

So David and his men went on their way. But Shimei kept going along the side of the hill opposite him, yelling curses as he threw stones and dirt at them.