Sourpuss etymology in English

Etymology Blog

English word sourpuss comes from English sour, English puss

Dictionary entry	Language	Definition
sour	English (en)	(intransitive) To become disenchanted.. (intransitive) To become sour.. (transitive) To make (soil) cold and unproductive.. (transitive) To make sour.. (transitive) To spoil or mar; to make disenchanted.. To macerate (lime) and render it fit for plaster or mortar. (music) Off-pitch, out of tune.. (of petroleum) Containing excess sulfur.. (of soil) Excessively acidic and thus infertile.. [...]
puss	English (en)	(dated, hunting) A hare.. (informal) A cat.. (vulgar, slang) The vulva (female genitalia).. (vulgar, slang, chiefly, _, North America) A coward; a wuss; someone who is unable to stand up for him- or herself.. A girl or young woman. (slang) The mouth.
sourpuss	English (en)	A person who is habitually gloomy, sullen or miserable; a grouch.

Sourpuss etymology