Wearing a long face is an expression used to describe someone who is feeling sad or unhappy. It can be expressed in three different ways: moping, pouting, and sulking. Moping is when someone is feeling down and listless, pouting is when someone is expressing their displeasure with a frown, and sulking is when someone is showing their unhappiness through a sullen attitude. All three of these expressions are associated with wearing a long face.