The term "Diskos" is derived from the Greek language, and it historically refers to what can be best described as "a thing of throwing". This term is closely associated with the field of athletics, particularly the sport of discus throw, where athletes are required to throw a heavy disc—known as a discus—as far as possible.

In ancient Greece, the discus was an important part of the athletic contests of the Olympic Games, and thus the word "Diskos" came to signify this activity of throwing a disc. Now, let us examine the given options:

1. A thing of pushing: This is incorrect because pushing does not relate to the original Greek context of "Diskos".
2. A thing of eating: This is incorrect, as "Diskos" has no connection with eating or food-related activities.
3. A thing of playing: While throwing might involve an aspect of playing, the specific historical and linguistic meaning of "Diskos" is centered around the act of throwing.
4. A thing of throwing: This is the correct answer, as it directly reflects the activity associated with the term "Diskos" in Greek culture and athletics.

Thus, the correct choice is "A thing of throwing".