to  blow  one's lines
blow
bləʊ
blew
<i>one's</i>
wʌnz
vanz
lines
laɪnz
lainz

Definition & Meaning of "blow one's lines"in English

to blow one's lines
01

(in a play, live performance, etc.) to forget or make errors in the delivery of one's dialogue 

Examples
I had learned the speech off by heart, but I was so emotional that I started blowing my lines about halfway through. 
LanGeek
Download LanGeek app
langeek application

Download Mobile App

App Store