Draconic

When the world was young, there were dragons. As they grew and other races appeared, they were the most dominant force of every landscape. None could stand against the power of the dragons. It was known as the Age of Dragons. For many thousands of years, the most important and widespread language was Draconic.
  Over time that slowly changed. Humanoids, Demons, and Elementals grew in power. No longer were the dragons uncontested champions of the world. They slowly began to be displaced by others. Their influence remains. To this day many sayings are still used in thier draconic form. Few individuals actually know the true meaning anymore. Even fewer individuals are proficient in Draconic.
 

Idiom Examples:

• majak ekess ve

This saying was originally just intended as an offering for a visit with a dragon, literally a dragon would ask you to "give it to me". Somehow over the years it has taken on the saying to imply that you shouldn't look too closely at what a gift is, but to appreciate the fact that you were given a thoughtful gift.

• thric loerchik, thric trenul

This saying was actually started by humans, implying that visiting dragons would often end in injury or pain. Eventually dragons caught on to this idiom, but instead used it as more of a threat than advice. Today it still means to sacrifice time or effort or money to earn something in return.

• wiap qumadosfan svadrav mobi

This somewhat awkward saying means to delay talking about something or dealing with a problem until it happens. We'll talk about that issue when it becomes a problem. It is based off a common draconic saying to fly across that ocean once we reach it, which had a very similar meaning to the current idiom. However, over time as humanoids lost understanding of draconic it has been shortened and words removed to create the idiom it is today, which literally means "fly ocean when there".
 

Other word examples:

• Midxinor

The middle day of the week is a portmanteau of the common word middle and the draconic word xinor, which means week. It is the middle day of the week.

• inloilfrey

Sometimes a dragonshard is called an inloilfrey by some. It is a less common alternate name. It literally means "shard" in draconic.

• Juanth Treskri

The name of the world literally means "old world" in draconic. The dragons always referred to the world and continent as The Old World. The name has stuck, even though the translation has been lost to time.