What does "winded" actually mean?

Question

i.e. what happens inside your body when you get winded if you fall for example?

Answer 1

You are winded when someone knocks the air out of you like if you fall on a football and land on it with your stomach.

Answer 2

who cares

Answer 3

short of breath

Answer 4

Breathing heavily.

When you fall it's having the wind knocked out of you.