What does 孝行 mean?
孝行 is a Japanese noun meaning “filial piety” in English. It can also be translated as “showing devotion (to someone)” depending on context. It is written as 孝行 in kanji, こうこう in hiragana, and koukou in romaji. This word is part of JLPT N2 vocabulary.
Example sentence
孝行したいときに親はなし。
When one would be filial, one's parents are gone.