lifebuoy
/L AY1 F B UW1 IY0/noun
- 1
A buoyant object (most commonly torus-shaped) that is used as a life-saving device by keeping a person afloat;
- 2
(metaphoric) Something that rescues one from difficulties.
Synonyms
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Source: https://en.wiktionary.org/wiki/life%20buoy, https://en.wiktionary.org/wiki/lifebuoy