Definition - Restating or reinterpreting what you have just said.
Note: Those who do this are not yet called epexegetes.

Example -
Whenever you use i.e. or that is to say or in other words and then restate what you just said, you are performing epexegesis.

Etymology -
The word derives from the Greek epi, in addition + exegeisthai, explain or interpret (from ex, out + hegeisthai, to lead or guide).

Oxford English Dictionary -
Its first citation is from 1621:
"The latter part of the Apostles assertion is an epexegesis, or explication, of the former."
(Bishop R. Montagu, Diatribæ 163 )

Please comment