生锈 (生銹) shēngxiù

shēngxiù verb to rust; to grow rusty; to corrode; oxidization
Domain: Modern Chinese 现代汉语
Notes: (CC-CEDICT '生銹')

Contained in

• 脑子生锈(腦子生銹) brains rusty; ossified thinking
• 永不生锈的螺丝钉(永不生銹的螺絲釘) a screw that never rusts — sb who selflessly and wholeheartedly serves the Communist Party, like Lei Feng 雷锋, to whom the metaphor is attributed
• 刀不磨要生锈，人不学要落后(刀不磨要生銹，人不學要落後) a blade will get rusty if it is not sharpened; a man will fall behind if he doesn't study