What is Frown ?
Frown is (noun) pulling your eyebrows together as a sign that you are angry or worried Take that frown off your face everything’s going to be all right. Synonym scowl (verb) to pull your eyebrows together because you are concentrating or worried He frowned as he tried to do the calculation. to frown on or upon something to disapprove of something The teachers frown on singing in the corridors. The company frowns on people who bring food into the office. This type of behaviour is frowned upon by the municipal authorities. Antonym (all senses) smile
source: Easier English, Student Dictionary Upper Intermediate Level