N-COUNT [usually singular](尤指因头发乱糟糟而)不顺心的一天,紧张的一天 People sometimes say they are having a bad hair day when they do not feel very happy or relaxed, especially because their hair does not look good. (尤指因头发乱糟糟而)不顺心的一天,紧张的一天 [informal]
All this fuss is because Carol is having a bad hair day.