over the line的意思大概就是“越过红线”、“过分”、“有些事该说。有些事不该说”
"Over the line" is an expression that means to do something that is inappropriate, unethical, or illegal.
1. I can't believe he said that about his boss - he really crossed the line.
2. You can't expect me to do something like that - it's over the line.
3. His behavior was over the line and he was reprimanded for it.
4. She was warned that if she crossed the line again she would face serious consequences.
Batman Unburied E03
MONTOYA: You know, I got excited when I got partnered with you instead of one those scumbags out there. Partly cause I wouldn’t have to be fighting off some pervert. But mostly ‘cause you’re one of the only other cops here that gives a damn about what this job is supposed to be. But sometimes you get like this, and... You’re not gonna like what I’m about to say, but you need to hear it: This off the rails, dog with a bone shit? This is what broke your father.
BARBARA: Renee. There’s a line, and you’re way over it. Don’t think you can --
[THE LOUDEST KNOCK YET ON THE DOOR.]