expression
n. C / Un. a look on someone's face that shows what they are thinking or feeling. It can also be a word or phrase used to say something.
n. the look on a person's face that conveys a particular emotion; also a word or phrase that communicates an idea. In technical contexts, it refers to a mathematical or logical string of symbols.
She had a happy expression on her face.
The teacher used a common local expression to explain the difficult concept to the students.
While her verbal response remained strictly professional, her facial expression betrayed a deep-seated frustration that the rest of the committee chose to ignore.
Borrowed from Middle French expression, from Late Latin expressiō, expressiōnem (“a pressing out”). Morphologically express + -ion.
Countable when referring to a specific phrase or facial look; uncountable when referring to the general act of showing feelings.