"A stab in the dark" means to make a wild guess or make an attempt without much knowledge or information. There are several synonyms for this phrase, such as a shot in the dark, a blind guess, a leap of faith, a speculation, a conjecture, or a hunch. All these phrases indicate that the person is trying to make a guess without any real certainty. While these phrases are useful in some situations, it is essential to gather any available data or information before making a decision in most cases. While taking a stab in the dark can be an effective strategy sometimes, it should not be relied upon too often.