attrition
at-tri-tion
noun
The action of wearing something away by rubbing or friction.
"Constant attrition from the waves eroded the cliff face."
noun
Gradual reduction in numbers, strength, or effectiveness through sustained pressure.
"The war of attrition slowly wore down the enemy forces."
Thesaurus
Synonyms: abrasion, detrition, corrasion, contrition, contriteness, grinding