What is a harbour dasher?

A "harbour dasher" is not a commonly known term. It's possible that it's:

* A regional term: It might be a local name for a specific type of boat or vessel used in a particular harbor.

* A nickname: Someone might have given a specific boat this nickname.

* A made-up term: It could be a fictional term from a book, movie, or game.

To understand what a "harbour dasher" is, I need more information.

Could you provide any context? For example:

* Where did you hear the term? (Specific location, book, etc.)

* What is the context of the term? (What was it being used to describe?)

With more information, I can help you figure out what a "harbour dasher" is!