'Sounding' in the Bible

Then straight away everyone took his robe and put it under him on the top of the steps, and, sounding the horn, they said, Jehu is king.

And looking, she saw the king in his regular place by the pillar, and the captains and the horns near him; and all the people of the land giving signs of joy and sounding the horns. Then Athaliah, violently parting her robes, gave a cry, saying, Broken faith, broken faith!