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adj. Chiefly British
[From po, chamberpot (a po-faced expression being likened to that of a person observing the contents of a chamber pot with disgust), from French pot de chambre, chamber pot : pot, pot + de, of + chambre, room.]
(of a person) wearing a disapproving stern expression
[C20: possibly from po + poker-faced]
Chiefly Brit. having an overly serious demeanor or attitude; humorless.
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|Adj.||1.||po-faced - humorless and disapproving|
Britain, Great Britain, U.K., UK, United Kingdom, United Kingdom of Great Britain and Northern Ireland - a monarchy in northwestern Europe occupying most of the British Isles; divided into England and Scotland and Wales and Northern Ireland; `Great Britain' is often used loosely to refer to the United Kingdom