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If someone is po-faced, their face looks tight, , and ready to . They are not just quiet. They look as if your joke was in poor taste, or as if they will not be by anything. It is British, a little old-fashioned, and a little as a description — newspapers like it for stiff officials and for people who will not laugh. Though actually, it is not the same as a still, blank face that hides a feeling. A po-faced look shows the feeling: I do not think this is proper. You would not use it in a careful letter about someone you respect; it has a of mockery.
板著臉、一臉不以為然（英式，帶點「覺得你不像話、一點都不好笑」）。
組成Uncertain. It probably comes from po, old British slang for a chamber pot, from French pot de chambre — the face you would pull if one were held out to you. It may also have been nudged by pooh, or by poker-faced, or even heard as poor-faced. Nobody has a single tidy proof.
原始詞典資料2 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
po-facedadj/ˈpəʊ.feɪst/
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Wearing a particularly stern and disapproving expression; humourless; priggish.
- Nae hassle man . . . I'll git oaf the skag, and Saughton's barry fir hash. It'll be a piece ay pish likesay . . . he sais, as he's escorted away by a po–faced labdick.
- I mean, you would never guess if you came up from the South to Edinburgh in August that it is such a po-faced, humourless place, now would you?
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Poker-faced.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。