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noun (common) (futsuumeishi), noun or participle which takes the aux. verb suru, intransitive verb, adjectival nouns or quasi-adjectives (keiyodoshi)
filial piety, being kind to one's parents, taking care of one's parents
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親孝行したいときには親はなし。
By the time you wish to be a good son, your parents are long gone.
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