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The opposite of 凹 (āo), which means "concave, sunken, or hollow," is 凸 (tū). 凸 refers to a shape that is "convex" or "protruding." While 凹 describes a surface that curves inward, 凸 describes a surface that curves outward.
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凹 (āo) is used to describe something that is concave, sunken, or hollow. For example, 凹凸 (āotū) is used to describe something that has a bumpy surface, with both concave and convex parts.
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