લોહું ને ધોળું, ન વપરાય તો બીગડી જાય.

lōhuṁ nē dhōḷuṁ, na vaparāya tō bīgaḍī jāya.

Literally: Iron and white, if not used, they get spoiled.
What it means: Skills or resources that are not utilized will deteriorate.

કહેવત સમુદાય (Kahevat Samuday) · read from the scan by machine — the Gujarati itself is unchecked · English is machine-made and nobody has checked it yet

Heard it differently, or know we've got the sense wrong? Tell us — that is exactly the kind of correction this needs.