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saver

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life saver

Someone or something that provides crucial help in a difficult situation. The term is almost always applied to situations that are not literally life-threatening. You're a real life-saver for coming over and fixing my flat tire. The knife I brought on the camping trip turned out to be a life saver when we realized we had forgotten a can opener.

See also: life, saver

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.