- (I'd) better be going.
- (I'd) better be going. & (I'd) better be off.an expression announcing the need to depart. •
Bob: Better be going. Got to get home. Bill: Well, if you must, you must. Bye.
•Fred: It's midnight. I'd better be off. Henry: Okay. Bye, Fred.
•Henry: Better be off. It's starting to snow. John: Yes, it looks bad out.
Dictionary of American idioms. 2013.