A double is when you hit the ball and make it to second base without getting out. you get two bases on your hit.
double my bet
ROLLOVER
If you mean battling in double mode you have to run into a couple and they will battle you double
echo
double dare you???
ddd
double rainbow is a reference to a popular youtube video
Double Extra Large, this is a unit for clothes sizes.
a double standard
You mean...twins?
5+6
dual