Frankly, we should thank the Germans

for this simple word, which does so much work.

frank / frængk / Noun, Adjective, Verb

1. [Noun, proper: Franks] A member of the Germanic people who conquered Gaul about 500 AD.
2. [Noun, common] A small, smooth, bland-tasting sausage commonly served in an elongated bun.  
3. [Adjective] Brutally honest, straightforward, without sugar coating in speech or writing.  
4. [Verb] To stamp a postmark cancelling it, or to stamp an envelope in some way permitting it to be delivered free of charge.

Dr. Goodword is at the lectern:

With frank we get a bargain: at least four distinct words for the price of one. However, as the Word History will show, if we explore their backgrounds, we find that they all come from the same source.

All of the meanings of frank, believe it or not, originate in the same Old Germanic word which probably meant "free". It was first recorded in Medieval Latin in reference to the Franks but also as an adjective francus meaning "free".

The land of the Gauls conquered by the Franks kept the latter's name, France today, and in all probability the Franks were called "the free ones" because they were the conquerors. For whatever reason, they were associated with freedom and, in particular, speaking freely, hence the sense of the English adjective.

The postal application originally referred to stamping an envelop for delivery free of cost. A little Frenchman was known as a Franciscus in Late Latin and this word went on to be Francis and Frances in French. Francis was reduced back to Frank in English.

Frank the hotdog? This frank is a clipping of Frankfurter, referring to a sausage originally made in Frankfurt, Germany. This city is located by an ancient ford used by the Franks and hence picked up the name Frankfurt am Main "the Franks' ford on the Main".