erode (v.) Look up erode at Dictionary.com
1610s, "gnaw or eat away" (trans.), a back-formation from erosion, or else from French éroder, from Latin erodere "to gnaw away, consume," from assimilated form of ex- "away" (see ex-) + rodere "gnaw" (see rodent). Intransitive sense "become worn away" is by 1890s. Related: Eroded; eroding. Originally of acids, ulcers, etc.; geological sense is from 1830.