What does this paragragh means,please?

Question

Hi, I am reading a Sherlock Holms novel written by Doyle and Carr, and I can't understand a paragraph. It goes like this: "That's me, Mister detective!" said he." Saw you fight yesterday. You could be better, but you'll do. One day, my man, they may make prize-fighting legal. Till they do, a gentleman's got to arrange a neat little mill in secret. Stop a bit, though!"
Does that mean " I saw your fight yesterday, and you were good. One day, they will make wager for boxing legal."? And I don't understand "till they do,.....Stop a bit, though!"
Please kindly explain. Thanks in advance.

Answer 1

"Till boxing for money is made legal - fights have to be arranged in secret."

"Stop a bit, though!" is just a version of, "Hang on a minute!"/"Wait up!", I think in this case. A bit more context with next paragraph or sentence might help.
It could just mean - "Oops" - in the sense the guy realises he saw Sherlock HolmEs(!) fighting the day the day before and now realises he's a detective - maybe = to being 'Police'.

Answer 2

Until they make prize-fighting legal, it's all good to have the occasional match behind closed doors. Be careful, though!

In old British, "to mill" is to fistfight, and "stop a bit" means be careful... as if you're walking through a dangerous wooded area and you need to stop every so often to make sure nothing's following you.

Answer 3

Taken out of context like that it makes little or no sense, and I have every one of the Holmes' mysteries. What is that from?

Answer 4

i think that they mean if you arrange a secret fighting mill you have to be careful to keep it hidden so that you wont get caught.

Answer 5

They solve their problems by fist fighting. It was not acceptable behavior. Therefore, they did it in secret.