woe 
/ˈwoʊ/ noun
plural woes /ˈwoʊ/ noun 1 [noncount] : a feeling of great pain or sadness
▪ She listened to his tale of woe. [=his sad story] 2 woes [plural] : problems or troubles
▪ She may have found a remedy to her financial woes. [=her problems with money] ▪ The city's traffic woes are well-known.
▪ She listened to his tale of woe. [=his sad story]
▪ She may have found a remedy to her financial woes. [=her problems with money] ▪ The city's traffic woes are well-known.
woe is me
— used in a humorous way to say that you are sad or upset about something ▪ Oh, woe is me!
woe to or woe betide
old-fashioned — used as a warning that there will be trouble if someone does something specified ▪ Woe betide anyone who enters here! [=anyone who enters here will be harmed] ▪ Woe to any student who is late for her class. [=any student who is late for her class will be in trouble]
