rust spot; rust stain (on metal); rusty spot (on plants)

to rust away

rust stain

(bird species of China) slaty-backed flycatcher (Ficedula erithacus)

(bird species of China) rusty-cheeked scimitar babbler (Erythrogenys erythrogenys)

rust spot; rust stain (on metal); rusty spot (on plants)

to rust away

rust stain

(bird species of China) slaty-backed flycatcher (Ficedula erithacus)

(bird species of China) rusty-bellied shortwing (Brachypteryx hyperythra)

(of metal) to rust; to become rusty; (fig.) (of a skill etc) to get rusty; to deteriorate

tea stain (on the inside of a tea pot, tea cup etc)

verdigris

rust

to prevent rust; to resist rusting