凹
āo
concave; depressed; sunken; indented; female (connector etc)
a picture of 凹 → a sunken hollow, walls rising on both sides
The character 凹 is one of the rare purely pictographic shapes in Chinese — its outer strokes rise on the sides while the center dips down, directly drawing the hollow it names. What you see is exactly what it means.
这块木板中间有一个凹下去的地方。
zhè kuài mù bǎn zhōng jiān yǒu yī gè āo xià qù de dì fang。
There is a sunken spot in the middle of this wooden board.
地面上有一块凹陷，走路要小心。
dì miàn shàng yǒu yī kuài āo xiàn，zǒu lù yào xiǎo xīn。
There is a depressed area on the ground, so be careful when walking.
Words with 凹
中央凹
zhōng yāng āo
fovea centralis (depression in the macula retina, most sensitive optic region)
凹入
āo rù
recessed
凹凸
āo tū
concave or convex
凹凸不平
āo tū bù píng
(idiom) uneven (surface); bumpy (road)
凹凸印刷
āo tū yìn shuā
embossing
凹凸形
āo tū xíng
crenelated; corrugated
凹凸性
āo tū xìng
(math.) concavity
凹凸有致
āo tū yǒu zhì
curvaceous
凹凸轧花
āo tū yà huā
embossing
凹坑
āo kēng
concave depression
凹岸
āo àn
concave bank
凹度
āo dù
concavity