let me make myself crystal clear
I will speak sternly and put my thoughts into clear, unambiguous terms, so as to ensure you understand exactly what I mean. Let me make myself crystal clear—you are to do whatever I say, no questions asked. That's how an assistant earns their paycheck, understand? A: "Let me make myself crystal clear. You have to drop the package off by 5 PM sharp so that it will get delivered tomorrow—and it absolutely must get delivered tomorrow. Got it?" B: "Yes, sir."
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