'Expression' in the Bible

Then Nebuchadnezzar was filled with fury, and his facial expression changed toward Shadrach, Meshach, and Abed-nego. Then he gave a command that the furnace was to be heated seven times hotter than usual.

Now the queen [mother], overhearing the [excited] words of the king and his nobles, came into the banquet area. The queen [mother] spoke and said, “O king, live forever! Do not be alarmed at your thoughts or let your face be changed.