IdiomNatureVietnamese

Nước đổ lá khoai

Meaning: Advice or effort that has no effect at all; in one ear and out the other.

Literally: Water poured on a taro leaf

Example: “Khuyên nó bỏ thuốc lá như nước đổ lá khoai.” — Telling him to quit smoking is like talking to a brick wall.

English equivalent: Like talking to a brick wall

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Origin: Taro leaves are coated with a waxy surface, so water poured on them rolls straight off. Advice that is like water on a taro leaf makes no impression at all. English uses water off a duck's back for the same idea.

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