From the English adjective frank, which means “free” or “forthright,” we get the verb frank, which means “to mark mail with an official sign so that it may be mailed free.”
FRANK definition: direct and unreserved in speech; straightforward; sincere. See examples of frank used in a sentence.
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FRANK definition: 1. honest, sincere, and telling the truth, even when this might be awkward or make other people…. Learn more.
If someone is frank, they state or express things in an open and honest way. They had a frank discussion about the issue. You can talk frankly to me. He now frankly admits that much of his former playboy lifestyle was superficial. The reaction to his frankness was hostile.
To be frank is to be honest. Also, it's a hot dog. Eating a frank at the ballpark is, to be frank, an all-American experience. If you're open, honest, and candid, you're frank — that can mean refreshing honesty or too much information. Frank also has some lesser known uses.
From Middle English frank, from Old French franc (“free”), in turn from the name of an early Germanic confederation, the Franks, from Proto-West Germanic *frankō (“javelin, spear”). Doublet of Frank, franc and farang.
There are five meanings listed in OED's entry for the word Frank, three of which are labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.
Frank, n.¹ & adj.¹ meanings, etymology and more | Oxford English Dictionary