IPA: /ˈkɒŋkjʊbaɪn/
KK: /kɒŋˈkjuːbaɪn/
A woman who lives with a man and has a recognized relationship with him, but is not legally married to him, often having lower status than a wife.
In ancient times, a concubine could bear children for a man without the legal status of a wife.
Concubine → It is formed from "con-" (meaning together) and "cubare" (meaning to lie down). The word refers to a woman who lives with a man in a relationship akin to marriage but without the full legal status of a wife, thus implying a shared living arrangement.
Think of a woman who 'lies down' ('cubare') with a man 'together' ('con-') in a relationship that resembles marriage.