錆 rust

金 (gold) + 主 (master/mainly) + 円 (yen/circle)

★☆☆☆☆

16 strokes

Onyomi

The master's gold rusted, reducing its yen value.

( が ) さ＊びる

to rust KANA
★☆☆☆☆

錆付いた(さびついた)

rusted / rusty ★☆☆☆☆ KANA
錆 (rust) + 付 (stick to) = 錆付いた (rusted / rusty)