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sth + rust
rust 作不及物动词，表示（金属）自行生锈。
The metal gate rusted quickly in the coastal air.
金属门在海边的空气中很快生锈了。
生锈；使生锈
rusting — present participle of rust
先理解核心含义，再看它在真实句子里的用法。
生锈；使生锈
to become covered with rust, or to make metal become covered with rust
The metal gate rusted quickly in the coastal air.
金属门在海边的空气中很快生锈了。
可作不及物动词或及物动词：The gate rusted. / Rain rusted the gate.
氧化,尤指铁或钢。
To oxidize, especially of iron or steel.
使氧化。
To cause to oxidize.
感染锈菌。
To be affected with the parasitic fungus called rust.
(使)因懒散而退化；(使)因闲置而变得迟钝或受损。
To (cause to) degenerate in idleness; to make or become dull or impaired by inaction.
rust
Base
原形
rusts
3rd person
第三人称单数
rusting
-ing
现在分词
rusted
Past
过去式
rusted
Past participle
过去分词
Metal rusts quickly in humid climates.
金属在潮湿气候下会很快生锈。
The old gate rusted after years of rain.
那扇旧大门经过多年雨淋后生锈了。
The tools have rusted because they were left outside.
这些工具因为被放在外面而生锈了。
常见搭配：rust away（锈蚀掉）；也可表示“（因荒废而）退化”，如 His skills rusted.
The old gate will rust if it is not painted.
那扇旧大门如果不刷漆就会生锈。
Constant dampness causes the metal pipes to rust quickly.
持续的潮湿使金属管道很快生锈。
The abandoned bicycle has rusted after years of rain.
那辆被丢弃的自行车经过多年雨淋已经生锈了。
rust 作不及物动词，表示（金属）自行生锈。
The metal gate rusted quickly in the coastal air.
金属门在海边的空气中很快生锈了。
rust 作及物动词，主语是导致生锈的因素。
The heavy rain rusted the old tools left outside.
大雨使留在外面的旧工具生锈了。
rust away 表示因锈蚀而逐渐损毁或消失。
Without maintenance, the machinery slowly rusted away.
由于缺乏维护，机器慢慢锈蚀殆尽。
Not this
The iron rusted by the rain.
Use this
The iron rusted because of the rain.
不及物动词 rust 不能用介词 by 引出原因；by 短语用于被动语态引出施动者。表示原因应使用 because of the rain。
Not this
The iron is easy to be rusted.
Use this
The iron rusts easily.
表示“容易生锈”应使用主动结构 The iron rusts easily 或 The iron is easy to rust。形容词 easy 后的不定式用主动形式，不用被动形式 to be rusted。
Not this
The knife is rusted since last year.
Use this
The knife has been rusting since last year.
since last year 表示从过去持续到现在的时长，谓语应用现在完成（进行）时。is rusted 是一般现在时，不可与 since 搭配；应用 has been rusting 表示从去年起一直在生锈。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
锈蚀掉；锈烂
The old car has been sitting outside so long that it is starting to rust away.
那辆旧车在外面停了太久，已经开始锈烂了。
锈穿；锈透
The metal pipe rusted through and water leaked everywhere.
金属管锈穿了，水漏得到处都是。
容易生锈
This type of steel rusts easily in damp conditions.
这种钢材在潮湿环境中容易生锈。
因锈蚀而卡住（无法打开）
The old gate was rusted shut and would not budge.
那扇旧大门因锈蚀而卡死，怎么也推不动。
因闲置而荒废；因缺乏使用而退化
My French has rusted from disuse since I left school.
自从离开学校后，我的法语因长期不用而生疏了。
锈迹斑斑的旧车（或旧船）
I'm still driving that old rust bucket to work every day.
我仍然每天开着那辆锈迹斑斑的旧车去上班。
锈蚀从不休眠；衰败永不停歇（指事物会不断朽坏，须时刻维护）
You'd better paint the gate soon—rust never sleeps.
你最好赶紧把大门刷上漆——锈蚀从不休眠。
（幽默语）安息吧（用于报废的机器、车辆等）
After twenty years of service, the old tractor was left to rust in peace in the barn.
服役二十年后，那台旧拖拉机被留在谷仓里安息（锈烂）了。
铁因不用而生锈；死水因停滞而失去纯净，遇冷便会结冰；同样，无所作为会侵蚀心灵的活力。
Leonardo da Vinci wrote that 'iron rusts from disuse' to argue that inactivity harms the mind just as it damages metal.
列奥纳多·达·芬奇写下‘铁因不用而生锈’，以此说明无所事事对头脑的伤害，正如长时间的闲置会损坏金属一样。
宁可用坏，也不愿锈坏。
My grandmother lived by the proverb 'Better to wear out than rust out,' so she stayed active well into her nineties.
我祖母奉行‘宁可用坏，也不愿锈坏’这句谚语，所以她一直到九十多岁都保持活跃。
Use rusting naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把rust里的u想成一滴水珠，铁器淋到水(u)就会生锈(rust)；人也一样，久不活动就会“生锈”变迟钝。
语域：mixed 常见场景：日常谈论金属物品、文学或正式写作中的比喻、农业或植物病害描述 rust 作动词时，字面义“生锈/使生锈”在日常生活和科技语境中都很常用，属于中性；比喻义“（使）荒废、退化”多用于书面或正式语体；植物学中“染锈病”则常见于农业或专业描述。具体使用何种语气需根据义项和场合判断。
All six words rhyme with rust: they have the same stressed vowel /ʌ/ and final cluster /st/. Be careful with lookalikes ending in -ost: cost /kɒst/, lost /lɒst/, post /poʊst/, most /moʊst/, and host /hoʊst/ look similar but do not rhyme with rust.
Dictionary facts from ECDICT, WIKTIONARY.