MDBG Mobile Chinese English Dictionary (iPhone, Android, Windows Phone)

锈	xiù	to rust
生锈	shēng xiù	(of metal) to rust; to become rusty / (fig.) (of a skill etc) to get rusty; to deteriorate
锈蚀	xiù shí	to rust away
铁锈	tiě xiù	rust
锈迹	xiù jì	rust stain
流水不腐，户枢不蠹	liú shuǐ bù fǔ , hù shū bù dù	lit. flowing water does not rot, nor a door-hinge rust (idiom) / fig. constant activity prevents decay
锈斑	xiù bān	rust spot; rust stain (on metal) / rusty spot (on plants)
防锈	fáng xiù	to prevent rust; to resist rusting
不锈铁	bù xiù tiě	rust-resistant iron (an informal term for certain nickel-free stainless steels, usually of lower quality and less corrosion-resistant than true stainless steel such as 304 or 316)
永不生锈的螺丝钉	yǒng bù shēng xiù de luó sī dīng	a "screw that never rusts" — sb who is a loyal, dependable, humble contributor who quietly holds everything together and never fails in their duty, like Lei Feng 雷锋, to whom the metaphor is attributed