lifesaver /ˈlaɪfˌseɪvɚ/ noun plural lifesavers
plural lifesavers
Learner's definition of LIFESAVER
[count]
1
: something that saves a person's life救命之物 2
: something or someone which provides help that is badly needed帮助摆脱困境的人（或物） -
This multipurpose tool can be a real lifesaver when something needs fixing.当需要修理什么东西时，这件多用途工具就可以派上用场了。
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Frozen dinners can be lifesavers for busy parents.速冻晚餐食品对忙碌的父母来说可真帮大忙了。
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Thanks so much for offering to help. You're a real lifesaver!非常感谢你的帮助。你可真是帮了大忙了！