Dictionary

lifesaver

noun life·sav·er \ˈlīf-ˌsā-vər\

: something that saves a person's life

: something or someone which provides help that is badly needed

Full Definition of LIFESAVER

1
:  one trained to save lives of drowning persons
2
:  one that is at once timely and effective in time of distress or need
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First Known Use of LIFESAVER

1887
LIFESAVER Defined for Kids

lifesaver

noun life·sav·er \ˈlīf-ˌsā-vər\

Definition of LIFESAVER for Kids

:  someone or something that provides greatly needed help

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