What's the second part of the saying "Give someone an inch"?
I've consulted a number of dictionaries, and they all say the second part is "and they'll take a mile."
This is while in real life I've also heard some alternatives. For example:
You give 'em an inch, and they'll walk all over ya!
You give them an inch, you give them a centimeter.
Give him an inch, he thinks he's a ruler.