Learn English – Meaning of “You’re on” in this situation

meaning-in-contextphrase-meaning

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):

(Of an actor) on stage; performing.
That's your cue. You're on.

(Of an employee) working; on duty.

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.

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