double

Double entendre.

This idiom or expression like phrase represents:

A word or phrase having a double meaning, especially when the second meaning is a little on the “dirty” side!

Double whammy

This idiom or expression means:

Twice as bad.
When two bad things happen at once or almost at once.

Related:
Triple-whammy.

On the double.

This idiom or expression means:

Quickly.
Right away.

When someone says “Come here, on the double,” they mean something like “Come here, right now.”

History: 
This term comes from the military, where an order supposedly is to be carried out faster the normal pace.
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