ms. / miss / mrs. right
used to describe a woman one sees right to be married to and spend the rest of one's life with
What is the origin of the idiom "Ms. Right" and when to use it?
While the exact historical origin of "Ms. Right" cannot be pinpointed, it is known to have gained popularity in the mid-20th century as a way to describe an ideal or perfect woman who possesses all the desirable qualities and characteristics sought in a romantic partner.