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が汚れる

get dirty; become dirty

→ が
phrase Uncommon #19,154
get dirty; become dirty The が marks the thing that becomes dirty. The exact term が汚れる is the dictionary-form pattern; in natural sentences, 汚れてる or 汚れている is often used for “is dirty,” while 汚れた means “got dirty.”
JA: メガネが汚れる。
EN: Glasses get dirty.

服が汚れるのは嫌だな。

I don't want to get my clothes dirty.

あなたたちの血が汚れるだけだ.

It will only sully your blood.

— もののけ姫 (1997)

新聞で手が汚れる

The newspaper gets your hands dirty.

— ベルリン・天使の詩 (1987)