WOE BETIDE SOMEONE (OR WOE TO SOMEONE)
Meaning of WOE BETIDE SOMEONE (OR WOE TO SOMEONE) in English
woe betide someone ( or woe to someone)
humorous
a person will be in trouble if they do a specified thing.
→ woe
Concise Oxford English vocab.
Сжатый оксфордский словарь английского языка.
2004