Definition 1 of 2
The secret not known to everybody; olly 99.9% of the town knows the fact.
Mind you she is not a sex worker. She is romantically involved with and economically supported by her man and often they have and raise kids together.
It is a hangover of feudal privileges in India and enhances ones status. The Keeper of the Keep can be expected to be either a wealthy person or an extremely poor person. Yes! the fringe always has all the fun. We in the middle just watch.
(Do you ever understand why ladice call each other 'man' or 'pa' and gents: 'amma' or 'ma'?)
Definition 2 of 2
"Silly fellow! Don't you know Ram is keeping with that one? They may get married in December!"