make an honest woman

Verb

 * 1)  To marry (a woman), especially if there is an existing sexual relationship.
 * I thought about just asking Rosalyn to move in with me, but I decided it was time to make an honest woman out of her.

Usage notes

 * Also with "out of" for "of", especially in US English.
 * Formerly used where the woman had been dishonoured and the marriage was regarded as correcting this; nowadays used in a jocular fashion.