facial expression

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facial expression (plural facial expressions)

  1. The expression or countenance that seems to an onlooker to be represented by the appearance of a person or animals's face, resulting from specific use of that person's facial muscles.
    • 2017, Jennifer S. Holland, For These Monkeys, It’s a Fight for Survival., National Geographic (March 2017)[1]
      Facial expressions convey moods: Ritualized yawning—which starts with an oval mouth that breaks into a gaping one as the animal flings its head back—suggests tension.