口くち尻じり

noun

corners of the mouth; lip corners; commissures

Refers to the outer corners where the upper and lower lips meet. The term is neutral and used in both everyday and medical contexts.

• 笑わらうと口くち尻じりが上あがる。

  The corners of my mouth lift when I smile.

• 口くち尻じりが切きれて痛いたい。

  The corners of my mouth are cracked and painful.