"vessel," from late Old English pott and Old French pot "pot, container, mortar" (also in erotic senses), both from a general Low Germanic (cf. Old Frisian pott, Middle Dutch pot) and Romanic word from Vulgar Latin *pottus, of uncertain origin, said by Barnhart and OED to be unconnected to Late Latin potus "drinking cup." Celtic forms are said to be borrowed from English and French.
Slang meaning "large sum of money staked on a bet" is attested from 1823. Pot roast is from 1881; phrase go to pot (16c.) suggests cooking. In phrases, the pot calls the kettle black-arse is from c.1700; shit or get off the pot is traced by Partridge to Canadian armed forces in World War II.
"marijuana," 1938, probably a shortened form of Mexican Spanish potiguaya "marijuana leaves."
"to put in a pot," 1610s, from pot (n.1). Related: Potted; potting. Earlier it meant "to drink from a pot" (1590s).
To decline or deteriorate: “Since most of the businesses moved out to the suburbs, my old neighborhood has really gone to pot.”
To deteriorate; worsen; go downhill, go to hell: A group of men who had literally and figuratively let themselves go to pot get back into good physical condition/ A middle-aged man going to pot gets more than muscle tone from heavy exercise
[1831+; fr the condition of an animal no longer useful for breeding, egg-laying, etc, that will now be cooked in the pot]
A potentiometer (1940s+)
To shoot: He potted a woodchuck (1860+)
[all senses fr cooking pot, as something containing a pot-luck mess of food, something sooty and unattractive, something fat-looking, something to be filled by hitting the hunt's prey, etc]