Then the king’s countenance was changed, and his thoughts disturbed him, and he lost his self-control, and his knees knocked against one other
Other versions
King James Version
Then the king's countenance was changed, and his thoughts troubled him, so that the joints of his loins were loosed, and his knees smote one against another. English Standard Version
Then the king's color changed, and his thoughts alarmed him; his limbs gave way, and his knees knocked together.New International Version
His face turned pale and he was so frightened that his knees knocked together and his legs gave way.