ˌbad ˈhair day BrE AmE noun [countable] informal
a day when you are unhappy and easily upset, especially because your hair does not look the way you want it to look
ˌbad ˈhair day BrE AmE noun [countable] informal
a day when you are unhappy and easily upset, especially because your hair does not look the way you want it to look
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012