To set forth; to declare.

This man was instructed in the way of the Lord; and being fervent in the spirit, he spake and taught diligently the things of the Lord, knowing only the baptism of John. And he began to speak boldly in the synagogue: whom when Aquila and Priscilla had heard, they took him unto them, andEXPOUNDED unto him the way of God more perfectly. ( Acts 18:25-26 )