How to lose a debate?

We'll when you debate you might lose and thats an easy reality but how do we lose?

This are some of the things I can come up with for now, it's a work in progress but I'm very serious I want to know how to lose a debate and when do i know.

How to lose a debate?
-IMO(in my opinion)
The same way someone fights when he loses he must lose without regrets and to do so he must give his all and do his best and if he loses he should always learn something this is why we watch our opponents.

What to look for to learn from?
-IMO
Other than the obvious things you learn such as the facts thrown at you like in a fight you don't want to just memorize your opponents face and body size you want to learn his technuiqes and see if you can't implement them in future circumstances.

When do I know I should lose and not fight?
-IMO
When I know it'll benifit me and others and when I'm out of line.