noun
go steady; date exclusively
Loanword from English, used in Japanese to mean dating one person exclusively. Often used in the phrase ゴーステディーする.
彼とはもう半年くらいゴーステディーしている。
I've been going steady with him for about half a year.
高校のとき、初めてゴーステディーした。
I went steady for the first time in high school.