shot in the dark

big shot

A person with a reputation of importance or power.

chip shot

Something that is easy to do or to achieve.

dark cloud

A situation or future event that causes worry, problems or unhappiness, likened to such a cloud overhead in the sky.

dark horse

Someone who possesses talents or favorable characteristics that are not known or expected by others.

give it one's best shot

To make one's best effort or attempt; to try as hard as possible.

long shot

Something unlikely; something that has little chance of happening or working; long odds

look on the dark side

To examine a situation, usually unfavorable, from a negative perspective; to be pessimistic or miserable.

oh dark hundred

Some unspecified hour in the early morning (implies an unpleasant time to be awake)