be the day hell freezes over

To be an impossible or incredibly unlikely point or event in the future. The day that a Democrat like him gets elected in a blue-collar Republican town like this will be the day hell freezes over.

Common Names:

Name	Pronounced	Usage
Baldwin	['bɔ:ldwin]
Colin (1)	KAHL-in (Scottish, Irish, English), KOL-in (English)	Scottish, Irish, English
Vanya	-	Russian
Clement	KLE-mənt	English
Siv	SEEV	Swedish, Norwegian, Danish, Norse Mythology
ZaÏRe	-	Literature