This is the 3880th most frequent Japanese word.
カオ
Face.
The word 'カオ' is used to express appearance, specifically someone's facial expression, in this sentence.
彼は怒っているカオをしている。
He has an angry face.
Here, 'カオ' refers to someone's facial expression that communicates an emotion.
そのカオを見ると幸福が伝わってくる。
Looking at that face conveys happiness.
In this sentence, 'カオ' is part of the phrase 'カオを合わせる,' which means to meet someone in person, indicating a direct meeting or confrontation.