「Intercourse, sex」with「courtship display」meaning WHO, ANYBODY, EVERYBODY.「Sex and birds in full plumage during courtship display」meaning WHO, ANYBODY, EVERYBODY since nearly all species of birds pair with a mate until their young have fully fledged and are socially monogamous, but the next breeding season are with a different mate, yet all the while either the male, female, or both will copulate in quickies with another bird hitherto unknown and not to be seen again (hence, WHO?) and are not sexually monogamous, behavior that mimics most human beings, too.「Speak」with「bird」meaning WHO, WHOM. Perhaps the source of the English expression,「…a little birdie told me so…」To describe the source of information from an UNNAMED PERSON, or, a person whose name you do not know. These little birds may be why gossip「twitters」and「tweets」around the globe via the Internet.
　「Monogamy is one of several mating systems observed in animals. However, a pair of animals may be socially monogamous but that does not necessarily make them sexually or genetically monogamous. Social monogamy, sexual monogamy, and genetic monogamy can occur in different combinations. Social monogamy refers to the overtly observed living arrangement whereby a male and female share territory and engage in behaviour indicative of a social pair, but does not imply any particular sexual fidelity or reproductive pattern. The extent to which social monogamy is observed in animals varies across taxa, with over 90 percent of avian species being socially monogamous…. Sexual monogamy is defined as an exclusive sexual relationship between a female and a male based on observations of sexual interactions. …The incidence of sexual monogamy appears quite rare in other parts of the animal kingdom. It is becoming clear that even animals that are overtly socially monogamous engage in extra-pair copulations. For example, while over 90% of birds are socially monogamous, 'on average, 30 percent or more of the baby birds in any nest [are] sired by someone other than the resident male.' Patricia Adair Gowaty has estimated that, out of 180 different species of socially monogamous songbirds, only 10% are sexually monogamous. With birds, it appears that their locomotion method makes sexual interaction with non-pair mates far less difficult. However, offspring are far more successful when both the male and the female members of the social pair contribute food resources.」
　　[　https://en.wikipedia.org/wiki/Monogamy 2012-12-29　]　

Modern definitions (that generally disregard history) …excluding politically incorrect concepts and other meanings deemed offensive today; may list only pigeonholed definitions, euphemisms, or meaningless mnemonics)
Chinese: who
Japanese: who, someone, somebody, everyone, anyone, no-one, so-and-so, ?, which people?, this or that person, anybody, many people, "Mr So-and-so", everybody, whoever, anybody and everybody, with the best of them, as the next fellow, none other than, … himself, … herself, a certain somebody
Unihan extended: who? whom? whose? anyone?
EDRDG: who; someone; somebody