Frown

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A frown (also known as a scowl) is a Facial expression used to indicate displeasure, or disapproval.
The appearance of a frown varies from culture to culture. Although most technical definitions define it as a wrinkling of the brow, in North America it is primarily thought of as an facial expression of the mouth.

In those cases when used iconically, as with an emoticon, it is entirely presented as a curve of the lips facing away from the eyes ('down'). The mouth expression (facial) is also commonly referred to in the coloquial English phrase "turn that frown upside down" which indicates changing from sad to happy.
It most commonly the face expresses sadness, dissatisfaction, anger, worry or pain, although it is also a sign of deep concentration.