- Used other than as an idiom: see I, do.
- A traditional phrase said upon acceptance of marriage.
2003, Joanne Kimes, Sanford A. Tisherman, Pregnancy sucks: what to do when your miracle makes you miserable, ISBN 1580629342, 9781580629348, page 101:
- They'd been pushing for me to get pregnant ever since I said "I do." And now that I was, do you think they were happy? No way.
2008, Mary Holmes, Gender and Everyday Life, ISBN 0415423481, 9780415423489, page 75:
- When she said 'I do' at the altar she was deemed to have made herself sexually available to her husband whenever he might wish.