betide

And woe betide any member of the cabinet who upset his mistress.

Woe betide the conductor if he comes in too early after the ballerina’s pirouettes.

Woe betide the grounds passholder who shows up at the “wrong” entrance; you may be made to walk several blocks, though several on Monday attempted to argue with U.N. police.

"Woe betide you if you were a preacher and you misquoted," Lord Sentamu says.

Woe betide the civic leader in a company town who threatens to buck the company’s interests.