Etymology
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glum (adj.)

1540s, "sullen, moody, frowning," from Middle English gloumen (v.) "become dark" (c. 1300), later gloumben "look gloomy or sullen" (late 14c.); see gloom. Or from or influenced by Low German glum "gloomy, troubled, turbid." In English the word was also formerly a noun meaning "a sullen look" (1520s). An 18c. extended or colloquial form glump led to the expression the glumps "a fit of sulkiness." Glunch (1719) was a Scottish variant. Related: Glumly; glumness.

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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.

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