up and leave, go, etc.
up and (do something)
To do something quickly, unexpectedly, or abruptly, especially without warning or explanation. I must have offended him, because halfway through the conversation he just up and left. The town has been in a panic searching for a young girl who up and vanished over the weekend. Everyone asks how I came up with the story, thinking it must have taken all this time and planning, but the truth is one day I thought up the premise and then I just up and wrote it.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
ˌup and ˈleave, ˈgo, etc.(informal) leave, go, etc. quickly and unexpectedly: Without saying anything, she just upped and went.
Farlex Partner Idioms Dictionary © Farlex 2017