make (something) crystal clear

make (something) crystal clear

To make something very easy to understand by putting it into clear, unambiguous terms. A: "I'm going to make this crystal clear. You have to drop the package off by 5 PM sharp so that it will get delivered tomorrow—and it must get delivered tomorrow. Got it?" B: "Yes, sir." A great lecturer not only makes these abstract scientific concepts crystal clear but is also a very engaging speaker.

See also: clear, crystal, make

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