crystal clear
Meaning
Something that is perfectly transparent, easily understood, or entirely free from doubt.
Origin
Imagine gazing into a pristine mountain spring or holding a flawless piece of quartz: the transparency is absolute, without a single cloud or speck. For centuries, crystals—especially rock crystal quartz—have been revered for their natural, unblemished clarity, so perfect that light passes through them seemingly untouched. This pure quality of nature's optics gave rise to the phrase 'crystal clear,' first used literally to describe water or glass that mimicked this natural perfection. Eventually, this evocative image transcended the physical, becoming a vivid metaphor for any idea, explanation, or understanding that leaves absolutely no room for doubt or confusion—it's as plain to see as through the clearest gemstone.
Examples
- After the manager's explanation, the new project goals were crystal clear to everyone on the team.
- The mountain lake was so crystal clear that we could see fish swimming twenty feet below the surface.