franker是什么意思？

If someone is frank, they state or express things in an open and honest way.

When a letter or parcel is franked, it is marked with a symbol that shows that the proper charge has been paid or that no stamp is needed.

You can say 'to be frank' or 'to be frank with you' to introduce a statement which is your honest opinion, especially when the person you are talking to might not like it.