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countenance [countenance 词源字典]: countenance: [13] A person’s countenance has nothing to do with computation. Etymologically, it is how they ‘contain’ themselves, or conduct themselves, and the word itself is a parallel construction with continence. It was borrowed from Old French contenance (a derivative of the verb contenir ‘contain’), which meant ‘behaviour’, ‘demeanour’, or ‘calmness’ as well as ‘contents’, and originally had this somewhat abstract sense in English.

It was not until the 14th century that the meaning began to develop through ‘facial expression’ to the now familiar ‘face’ (traces of the original sense survive in such expressions as ‘put someone out of countenance’, meaning to make them lose their cool).
=> contain, continence[countenance etymology, countenance origin, 英语词源]
countenance (n.): mid-13c., from Old French contenance "demeanor, bearing, conduct," from Latin continentia "restraint, abstemiousness, moderation," literally "way one contains oneself," from continentem, present participle of continere (see contain). Meaning evolving Middle English from "appearance" to "facial expression betraying a state of mind," to "face" itself (late 14c.).
grouch (n.): "ill-tempered person," 1896, earlier "state of irritable glumness" (1890, in expressions such as to have a grouch on), U.S. college student slang, of uncertain origin, possibly from grutching "complaint, grumbling" (see grutch).
The Grouch, on the other Hand, gave a correct Imitation of a Bear with a Sore Toe. His Conversation was largely made up of Grunts. He carried a Facial Expression that frightened little Children in Street Cars and took all the Starch out of sentimental Young Ladies. He seemed perpetually to carry the Hoof-Marks of a horrible Nightmare. [George Ade, "People You Know," 1902]
The verb is 1916, from the noun. Related: Grouched; grouching. Grouch bag "purse for carrying money secretly" (1908), probably so called for keeping the cash hidden from compatriots; it is the source of the nickname of U.S. comedian Julius "Groucho" Marx (1890-1977), who supposedly carried his money to poker games in one.
mien (n.): "facial expression," 1510s, probably a shortening of Middle English demean "bearing, demeanor" (see demeanor) and influenced by Middle French mine "appearance, facial expression," which is of unknown origin, possibly Celtic (compare Breton min "beak, muzzle, nose," Irish men "mouth").
mug (v.2): "make exaggerated facial expressions," 1855, originally theatrical slang, from mug (n.2). Related: Mugged; mugging.
phiz (n.): 1680s, jocular abbreviation of physiognomy; hence "face, countenance, facial expression."