corrode
/kəˈrəud; kə`rod/ v[I, Ip, Tn, Tn.p]
~ (sth) (away) be destroyed or destroy (sth) slowly, esp by chemical action 腐蚀, 侵蚀（某物）（尤指化学作用）
The metal has corroded (away) because of rust. 该金属已锈蚀.
Acid has corroded the iron (away). 酸把铁腐蚀了.
(fig 比喻) a bitter envy that had corroded their friendship 使他们的友谊遭到损害的强烈的忌妒.