1. Yi
is the third person, equivalent to "she", "he", and "that" (mostly women).
It first comes from "Jianjia" in "The Book of Songs": The so-called beauty is on the side of the water.
It means that the sweetheart I miss is standing on the other side of the river.
2. Mother
A kind of laudatory name for aristocratic women in ancient times or generally refers to the elder women in the family or relatives.
For example: Mujin (aunt); grandmother; aunt; aunt.
3. Concubine
A woman in ancient times called herself humble.
Referred to as a female slave, or a woman that a man married outside his wife in the old days. The first wife of the upper class also called herself a concubine.
As a verb, it means to serve as a slave, or to marry as a minor wife.
As a pronoun, it is a modest word for women in the old days.
Extended information:
Ancient titles
The honorific titles for the other party or the other party's relatives include Ling, Zun, Xian, etc. Ling, which means good, is used to address each other's relatives.
For example, your father (the other party’s father), your father (the other party’s mother), your father’s wife (the other party’s wife), your brother (the other party’s brother), your son (the other party’s son), and your love (the other party’s daughter).
Old women call themselves "old people" modestly; princesses and queens call themselves "concubines" in front of the emperor; princesses and queens call themselves "my palace" in front of courtiers; widowed empresses call themselves "aijia"; folk women call themselves little girls and women of the people. ; Unmarried women call themselves slaves, etc.
Baidu Encyclopedia - Concubine
Baidu Encyclopedia - Yi
Baidu Encyclopedia - Mother