A bean

[been] /bin/
noun
alan l(avern) born 1932, u.s. astronaut.
roy (“judge”) 1825?–1903, u.s. frontiersman and justice of the peace: called himself “the law west of the pecos.”.
bean
/biːn/
noun
any of various leguminous plants of the widely cultivated genus phaseolus producing edible seeds in pods see french bean, lima bean, scarlet runner, string bean
any of several other leguminous plants that bear edible pods or seeds, such as the broad bean and soya bean
any of various other plants whose seeds are produced in pods or podlike fruits
the seed or pod of any of these plants
any of various beanlike seeds, such as coffee
(us & canadian, slang) another word for head
(slang) cool beans, excellent; impressive
(slang) not have a bean, to be without money: i haven’t got a bean
(informal) full of beans

full of energy and vitality
(us) mistaken; erroneous

(informal) spill the beans, to disclose something confidential
verb
(mainly us & canadian, slang) (transitive) to hit (a person) on the head
word origin
old english bēan; related to old norse baun, old frisian bāne, old high german bōna bean
bean
n.

old english bean “bean, pea, legume,” from proto-germanic -bauno (cf. old norse baun, middle dutch bone, dutch boon, old high german bona, german bohne), perhaps from a pie reduplicated base -bha-bha- and related to latin faba “bean.”

as a metaphor for “something of small value” it is attested from c.1300. meaning “head” is u.s. baseball slang c.1905 (in bean-ball “a pitch thrown at the head”); thus slang verb bean meaning “to hit on the head,” attested from 1910.

the notion of lucky or magic beans in english folklore is from the exotic beans or large seeds that wash up occasionally in cornwall and western scotland, carried from the caribbean or south america by the gulf stream. they were cherished, believed to ward off the evil eye and aid in childbirth.

slang bean-counter “accountant” recorded by 1971. to not know beans (american english, 1933) is perhaps from the “of little worth” sense, but may have a connection to colloquial expression recorded around somerset, to know how many beans make five “be a clever fellow.”
noun

a five-dollar gold piece (1850s+ underworld)
a dollar: without a coat on his back or a bean in his pocket (1900+)
a poker chip (1900+ gambling)
the head, esp the human head and brain: whistling at a crook is not near as effective as to crack him on the bean with a hickory stick (1900+)
a person of spanish-american background, esp a chicano (1920+)

verb

to strike someone on the head, esp to hit a baseball batter on the head with a pitch: not the first time i’ve been beaned (1910+)
related terms

full of beans, jellybean, loose in the bean, mean bean, spill the beans, use one’s head

bean