Meaning of ǎi:
ǎi
矮
Adjective
(of a person) short; (of a wall etc) low; (of rank) inferior (to); lower (than)
Wǒ de péngyǒu hěn ǎi.
我的朋友很矮。
My friend is very short.
Zhè dǔ qiáng hěn ǎi.
这堵墙很矮。
This wall is very low.
Tā bǐ wǒ ǎi yīdiǎn.
他比我矮一点。
He is a little shorter than me.