Become eaten away by rust or acid, eg (7)
I believe the answer is:
corrode
(Other definitions for corrode that I've seen before include "Growth in hazel buds" , "Slowly eat" , "Oxidize" , "Gradually weaken (metal)" , "Oxidise" .)
I believe the answer is:
corrode
(Other definitions for corrode that I've seen before include "Growth in hazel buds" , "Slowly eat" , "Oxidize" , "Gradually weaken (metal)" , "Oxidise" .)