Meaning of the word "the used key is always bright" in English

What does "the used key is always bright" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

the used key is always bright

US /ðə juzd ki ɪz ˈɔlˌweɪz braɪt/
UK /ðə juːzd kiː ɪz ˈɔːlweɪz braɪt/
"the used key is always bright" picture

Idiom

a proverb suggesting that constant use or practice keeps one's skills or mind sharp and prevents them from becoming dull

Example:
He continues to study even in retirement, believing that the used key is always bright.
Keep practicing your piano; remember, the used key is always bright.