銹

to corrode / to rust

handsome / refined / elegant / graceful / superior / show (loanword) / CL:場|场[chang2] / (literary) to grow / to bloom / (of crops) to produce ears

surname Jin / surname Kim (Korean) / Jurchen Jin dynasty (1115-1234)

gold / chemical element Au / generic term for lustrous and ductile metals / money / golden / highly respected / one of the eight categories of ancient musical instruments 八音[ba1 yin1]

to rust / to grow rusty / to corrode / oxidization

stainless steel

rust prevention / anti-corrosion

corrosion / rust

lit. brains rusty / ossified thinking

a "screw that never rusts" — sb who selflessly and wholeheartedly serves the Communist Party, like Lei Feng 雷鋒|雷锋[Lei2 Feng1], to whom the metaphor is attributed

a blade will get rusty if it is not sharpened; a man will fall behind if he doesn't study (idiom)