'Expression' in the Bible

Then Nebuchadnezzar was filled with wrath, and his facial expression was altered toward Shadrach, Meshach and Abed-nego. He answered by giving orders to heat the furnace seven times more than it was usually heated.

The queen entered the banquet hall because of the words of the king and his nobles; the queen spoke and said, “O king, live forever! Do not let your thoughts alarm you or your face be pale.