be off-book

theater To be able to recite one's lines without having the script in front of one. OK, everyone, you need to practice your lines at home. We need you all to be off-book tomorrow! I wish you wouldn't ad-lib like that. I know you're off-book, but you're throwing off the other actors who aren't as confident with their lines. How are you off-book already? Ugh, I'm having such a hard time memorizing my lines.

See also:

off-book
go off-book
a crying need
read between the lines
read between the lines, to
run down some lines
along the lines
lay some sweet lines on someone
no, yeah
hard lines

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