muff (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 muffed my lines. I had learned the speech off by heart, but I was so emotional that I started muffing my lines about halfway through.

See also: line, muff

See also:

blow (one's) lines
blow one's lines
fluff (one's) lines
fluff lines
(one's) mind goes blank
one's mind went blank
go blank
blank check
flub the dub
flub the dub, to

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