Pot
late Old English pott, probably reinforced in Middle English by Old French pot ; of unknown ultimate origin (compare with late Latin potus ‘drinking cup’). Current senses of the verb date from the early 17th century.
wiktionary
From Middle English pot, potte, from Old English pott(“a pot”) and Old French pot("pot"; probably from Frankish *pott); both Old English and Frankish from Proto-Germanic *puttaz(“pot”), from Proto-Indo-European *budnós(“a type of vessel”). Cognate with Saterland Frisian Pot(“pot”), Dutch pot(“pot”), Low German Pott(“pot”), German Pott(“pot”), Swedish potta(“chamber pot”), Icelandic pottur(“tub, pot”), Old Armenian պոյտն(poytn, “pot, earthen pot”).
The sense of ruin or deterioration was originally an allusion to being chopped up and tossed in a pot like a piece of meat. The slang term for toilets and the lavatory derives from chamberpots although now usually encountered as potty during children's toilet training.
Possibly a shortened form of Mexican Spanish potiguaya(“marijuana leaves”) or potaguaya(“cannabis leaves”) or potación de guaya(literally “drink of grief”), supposedly denoting a drink of wine or brandy in which marijuana buds were steeped.
Clipping of potentiometer.
Clipping of potion.
etymonline
pot (n.1)
"deep, circular vessel," from late Old English pott and Old French pot "pot, container, mortar" (also in erotic senses), both from a general Low Germanic (Old Frisian pott, Middle Dutch pot) and Romanic word from Vulgar Latin *pottus, which is of uncertain origin, said by Barnhart and OED to be unconnected to Late Latin potus "drinking cup." Similar Celtic words are said to be borrowed from English and French.
Specifically as a drinking vessel from Middle English. Slang meaning "large sum of money staked on a bet" is attested from 1823; that of "aggregate stakes in a card game" is from 1847, American English.
Pot roast "meat (generally beef) cooked in a pot with little water and allowed to become brown, as if roasted," is from 1881. Pot-plant is by 1816 as "plant grown in a pot." The phrase go to pot "be ruined or wasted" (16c.) suggests cooking, perhaps meat cut up for the pot. In phrases, the pot calls the kettle black-arse (said of one who blames another for what he himself is also guilty of) is from c. 1700; shit or get off the pot is traced by Partridge to Canadian armed forces in World War II. To keep the pot boiling "provide the necessities of life" is from 1650s.
pot (n.2)
"marijuana," 1938, probably a shortened form of Mexican Spanish potiguaya "marijuana leaves."
pot (v.)
"to put in a pot or pots," 1610s, from pot (n.1). Related: Potted; potting. Earlier it meant "to drink from a pot" (1590s). From 1860 as "shoot or kill game; shoot an enemy" (compare pot-hunter, potshot).
