What does this mean: I'll double dare you?

[OneTwo]

I'm having difficulties in understanding the meaning of "to double dare somebody", like in "I'll double dare you!". Any help is appreciated

[Narayanan Krishnaswamy]

'I dare you' is a normal reply of challenge.
May be in colloquial English ,people, in reply to the above, say "I double dare you."

"Go on, I dare you."
"I don't dare to say"
" How dare you write without my permission."
The above are some of the normal patterns in which 'dare' is used.

[Alan]

This is the sort of expression that children would use to each other when they are challenging each other to do things that involve risk and mischief. It would be a kind of extra dare.

Alan
_________________
English as a Second Language
You can read my ESL story Present Simple

[Gansvv]

Famously used by Jules (Samuel Jackson) in the movie Pulp Fiction, it refers to a "extra dare" over the traditional dare. Its dare squared!

Jules: "Say 'what' again. Say 'what' again, I dare you, I double dare you **, say what one more ** time!"

-gansvv