maintain one's composure, especially by refraining from laughter
（尤指忍住不笑）不动声色；保持镇定
help someone to remain calm and confident
使（某人）冷静自信
to keep herself in countenance she opened her notebook.
为保持镇定，她打开了笔记本。
disconcerted or unpleasantly surprised
不安的；惊慌的
&B{I put} him clean &B{out of countenance} just by looking at him.
我只是看着他，就让他非常不安。