dǎ
zhāo
hu
1
to greet sb by word or action
2
to give prior notice
你对面的美女好像在跟你打招呼
The pretty girl across from you side seems to be saying hello to you.
今天早上我有跟她打招呼
I said hello to her this morning.
我跟他打招呼的时候,他没有理我。
When I said hello to him, he ignored me.