猫耳を洗うと雨が降る（ねこみみをあらうとあめがふる）

Japanese vocabulary

Meaning: if a cat washes its ears, rain is coming

See it used in real works

• Example sentences from Japanese novels & web fiction (Massif)
• Hear “猫耳を洗うと雨が降る” pronounced in real videos (YouGlish)