To destroy a metal or alloy gradually, especially by oxidation or chemical action: acid corroding metal.
To impair steadily; deteriorate: "Doubt and mistrust could creep into our lives, corroding personal and professional relationships” ( Philip Taubman).
To be eaten or worn away.
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.