where do you draw the line?

Where do you draw the line is an idiom posed as a question that is setting a limit to something and deciding when a limit has been reached. Drawing the line can be pertaining to practically any type of situation where a limit or line, needs to be reached. For instance, perhaps you need to draw the line at how far someone is willing to go in a certain type of bad situation; this will be the limit of what they are able to do.