Common Phrase Meanings  |  C-Letter Sayings
Note: If you are looking for some examples of idioms, well, this site is full of them. There's even an alphabetical list containing a number of idioms, so give that a look if you're interested.

In addition, I'd like to mention that the origins for many sayings are uncertain. What's provided above, for example, are theories that may be plausible to how a phrase originated, but not necessarily so. 

Moreover, quotes that contain a particular phrase may be taken from old newspapers, poems, or books that were written centuries ago, but this by no means confirms that the phrase originates from said newspapers, poems, or books. The quote is to give you an idea on how old a saying is, so for example, if I quote a newspaper from 1835 because it uses a certain expression, than the expression is at least that old.
knowyourphrase.com - Popular Sayings With Their Meanings and Origins!
After waking up in the morning, millions of people choose to drink a hot (or cold) cup of 
coffee. Why, though, is this drink referred to as 'a cup of joe'? Indeed, how did coffee get 
this nickname?

The origin of this phrase is uncertain. However, there are a few theories. One theory is as 
follows: Josephus Daniels, who was Secretary of the Navy, banned U.S. Navy ships from 
serving alcoholic beverages in the year 1914. This ban led to sailors consuming more coffee 
(among other drinks). Since Josephus Daniels was responsible for the ban and thus perhaps partly blamed for the growing intake of coffee, they (the sailors) nicknamed the drink after him, thus it became 'a cup of joe,' Joe being short for Josephus. This theory, however, is considered to be unlikely.

A more plausible sounding theory is mentioned at Snopes, where it's explained that the word "joe" can simply mean 'an ordinary man.' For example, perhaps you've heard the term 'an average joe.' This term is sometimes used to describe someone who is thought of as being an everyday, ordinary kind of person. Thus, nicknaming coffee as 'a cup of joe' would indicate that it's a drink for the common man, or the average person.
* This place has the best tasting coffee in town; I'll definitely be ordering all of my cups of joe from this spot in the future!

* This morning, I made myself a steaming hot cup of joe; it's the only drink that fuels me for the rest of the day.
Cup of Joe phrase origins.

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Phrase Cup of Joe meaning.
A nickname for a cup of coffee. That's all there is to it!
C - a list of sayings.
Phrases and Idioms