fluff (one's) lines
To forget or bungle the words that one is supposed to say, as in a speech or play. My mind went completely blank as soon as I stepped on stage, and I totally fluffed my lines. I had learned the speech off by heart, but I was so emotional that I started fluffing my lines about halfway through. Dude, if you can't record the message without fluffing your lines, I'm going to have to get someone else to do it.
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