"erosion" in the noun sense
1. erosion, eroding, eating away, wearing, wearing away
geology) the mechanical process of wearing or grinding something down (as by particles washing over it)
condition in which the earth's surface is worn away by the action of water and wind
a gradual decline of something
"after the accounting scandal there was an erosion of confidence in the auditors"
4. corrosion, corroding, erosion
erosion by chemical action
Source: WordNet® (An amazing lexical database of English)
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