better get moving
(one had) better get moving
1. Said when one is about to or needs to leave. Well, we'd better be going. It was lovely to see you, as always. Better get moving before I miss my train!
2. Said as an imperative to make (more rapid) progress on something, such as a project. You had better get moving if you're going to finish all of these cupcakes before the party. I better get moving on wrapping these presents. There are dozens of them!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
(I'd) better get moving.
Inf. an expression announcing the need to depart. Jane: It's nearly dark. Better get moving. Mary: Okay. See you later. Bob: I'm off. Good night. Bill: Look at the time! I'd better get moving too.
(You'd) better get moving.
an expression encouraging someone to leave. Jane: It's nearly dark. Better get moving. Mary: Okay. I'm leaving right now. Bob: I'm off. Good night. Bill: Yes, it's late. You'd better get moving.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.