lifesaver

1. A lifeguard or other rescuer. · My dad loves his job as a surf lifesaver.· Paramedics are not just ordinary workers but lifesavers with a very important job.
2. A life buoy. · They threw him a lifesaver and then hauled him up onto the boat.
3. Any lifesaving tool or item of supplies. · When I got lost in the woods, my Swiss Army knife was a lifesaver.
4. Someone or something that is very useful or helpful. (figuratively) · Thank you so much for fixing my car; you're a real lifesaver!· This shop is a lifesaver on a hot day when you're craving a cold drink.

الجمع lifesavers