A Good Sword Never Get Dull - 宝刀不老

宝刀不老 (bǎo dāo bù lǎo)

宝: precious, unique

刀: sword, big knife

不: not, never

老: grow old, here means rust

Literal translation: A good sword remains always sharp; The treasured sword is not yet blunt.

Generally it's used to describe that some old people are old but still vigorous in mind and body.

Corresponding English idiom: A good sword never get dull.


Example sentence: He is already 40 years old, but "a good sword remains always sharp", he still plays basketball as well as young people.
(他已经四十岁了，不过宝刀不老，打篮球依旧不输年轻人.)