It is something you do that you are not sure about the outcome. Another word would be gamble or risk.
"la chance" means (good) luck in French.
They mean the same thing because fat chance is sarcastic. The "fat chance" is said, it really means little chance or "slim chance."
An outside chance
It means completely by chance.
It means the same as "to have a chance."
little or no chance of success.
They don't (quite) mean the same thing, the expression:'fat chance' means there is no chance,'slim chance' means that it will be difficult but there is just a chance.
question is,are you willing to give that chance?
by any chance
No. A 40% chance of rain means that there is a 40% or 2 in 5 chance that it will rain. A 100% chance of rain would mean that it will rain.
Assuming that you mean "bonne chance" it simply means "good luck" in French
Give peace a chance
"Bonne chance" means "Good luck".