'Cursing' in the Bible

because they did not greet the Israelis with food and water, but instead hired Balaam to oppose them by cursing them, even though our God turned the curse into a blessing.

And I took up the cause against them, cursing them and giving blows to some of them and pulling out their hair; and I made them take an oath by God, saying, You are not to give your daughters to their sons or take their daughters for your sons or for yourselves.