吹或扔一个吻， 表示从远处送个有意的吻， 通常在道别时，亲吻自己的指尖并把手挥向道别的人。

Meaning : To indicate an intended kiss from a distance, usually in bidding farewell, by kissing one's own fingertips and moving the hand toward the person greeted.

youdao

我向祖父道别，不知道我再也见不到他了。

I said good bye to grandfather, not knowing I would never see him again.

youdao

那么您如何有风度地、得体地向您的同事道别呢？

So, how do you say goodbye with grace and tact?

youdao