go steady (with someone)
To date someone exclusively. Don't ask Jill out—she's already going steady with Bobby. Are those two really going steady?
go steady
Date one person exclusively, as in Parents often don't approve of their children's decision to go steady. This usage may be obsolescent. [Slang; c. 1900] Also see go together, def. 2; go with, def. 1.
go steady
have a regular romantic or sexual relationship with a particular person. informal 1905 Edith Wharton The House of Mirth I thought we were to be married: he'd gone steady with me six months and given me his mother's wedding ring.
go ˈsteady (with somebody)
(old-fashioned, informal) have somebody as a regular boyfriend or girlfriend: Martin and Ingrid have been going steady for nearly a year.