blow (one's) lines(redirected from blow one's lines)
blow (one's) lines
To forget or bungle the lines that one is supposed to say, as in a play. My mind went completely blank as soon as I stepped on stage, and I blew my lines.
blow one’s lines
tv. to forget one’s lines in a play; to speak one’s lines incorrectly in a play. There I was in my first major role, and I blow my lines!