There is no specific dictionary-type definition for a dark debate. It may refer to debating a topic that is or can turn dark. This could include topics such as government sanctioned torture or euthanasia.
of Debate
A mock of something is a replica or display of the original. A mock debate would be like practice debate done by a high school debate team or similar.
debate
"Con" is short for "contra" meaning against in a debate. In a debate setting, "con" refers to the position or participant arguing against a specific proposition or resolution.
You didn't say if you meant the phrase "in the dark" as the literal meaning or the idiomatic meaning. Literal: "When the moon sets, we will be in the dark." Idiom: "Bill is mad at me, but I am in the dark about the reason."
Debate
Kurai means "dark."
for some one who enters the presidential debate late
The meaning of Prieto is dark. The term is most commonly a surname which eludes to one having dark hair or skin.
zayn's hair is really dark brown( some could debate black)
dark cell, dungeon
dark haired