I'd like to know the reason for the punctuation of the noun "brush-off" and the verb "to brush off": they have related meanings, but "brush-off" is the result of "to brush off", essentially. But one cannot write "to brush-off" as that just looks weird, as it is used for the noun version.
So the question, is the hyphen often used like this in English to differentiate a derived noun from a verb?