In the movie, Inception, 2010 film.
EAMES was sitting down, and COBB approached to him. And said,
"You're on. You've got an hour. Now get us something useful."
I googled it and found this :
https://english.stackexchange.com/questions/36434/why-does-youre-on-mean-i-agree
But, seems it doesn't make sense for this. Right?
I just try to guess and maybe it means "It's your turn." doesn't it?
Could you please give a few examples in order for me to understand quick?
Thank in advance.
Best Answer
In this case, since EAMES already works for COBB, I think the meaning is more along the lines of definition 5 or 5.1 at oxford dictionary.com's ON definition (thanks to MaulikV for the link):
I would lean more toward the "actor giving a performance" definition, as COBB's task is to trick someone into giving away information, but I think both senses are appropriate.