The dream about colleague, denotes to your ability be a part of some group. To get the better interpretation of your dream, please see the meaning of coworker.
Dream dictionary: Colleague dream meanings
Dreaming that you play chess or checkers with a colleague indicates an upcoming quarrel with this person, and the result will be the same as the game you dream to be playing.
…To prove something in a dream is a testimony of one’s right. To argue and prove one’s case in a dream means a dispute with a colleague, whereby the one who wins the case in the dream is at fault in wakefulness….