noun
lifesaver
LYF-say-vuh
noun
1
Someone or something that saves a person's life, especially by rescue.
"The off-duty nurse was a lifesaver after the crash."
2
Someone or something extremely useful or helpful in a difficult situation.
"This spare charger has been an absolute lifesaver on the trip."
"Her notes were a lifesaver before the exam."
How to Use Lifesaver
Learner’s notesIn plain EnglishSomething (or someone) that rescues you, literally or figuratively.
When to use it
The "hugely helpful" sense is very common in casual speech.
Common pairings
an absolute lifesaver
be a lifesaver
Word Forms
lifesavers plural
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The off-duty nurse was a _____ after the crash.
Etymology
A compound of life + saver, describing anyone or anything that saves a life — later extended to mean anything hugely helpful.