a life-saver

someone or something that gives you a lot of help when you are in a very difficult situation When you're stuck in traffic like this, a mobile phone's an absolute life-saver.

Common Names:

Name	Pronounced	Usage
Holcomb	['hɔlkəum]
Gilchrist	-	Scottish
JÓHannes	-	Icelandic, Faroese
Aintzane	-	Basque
Pax	-	Roman Mythology
Sanaz	-	Persian