woe betide somebody
woe betide (one)
Unpleasant things will happen to one. And woe betide anyone who tries to ruin my plans!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
ˌwoe beˈtide somebody(formal or humorous) there will be trouble for somebody: Woe betide anyone who arrives late!
Farlex Partner Idioms Dictionary © Farlex 2017