唉

āi

interjection or grunt of agreement or recognition (e.g. yes, it's me!)

to sigh

This is an interjection or onomatopoeia — it represents a sound.

Words with 唉

唉唉

āi āi

(onom.) sighing voice

唉姐

āi jiě

granny (dialect)

唉声叹气

āi shēng tàn qì

sighing voice, wailing breath (idiom)