You're a lifesaver spoken language hyperbole
This phrase can be expressed alternatively with the syntax "Someone be (a/an) life-saver/life-savers."
Said when someone who is extremely helpful to you, especially in case you are facing difficulties or problems
I was starving to death when you gave me a piece of bread. You're a life-saver.
Thank you for helping me prepare for the exam. You're a life-saver!
You helped me overcome that tough challenge. You're a life-saver!
Used to to emphasize that attention is paid to the individuals who complain or cause problems
To assist someone to do something illegal or wrong
Use one's influence and power to support someone
1. Said when you decide to use your social influence to have an advantage over other people
2. To make money quickly by selling your personal properties or financial assets
3. To die or pass away
The word ''life-saver'' is singular/plural depending on the subject of the sentence.
They brought me the key that I had left at home. They were absolutely life-savers.
Rainy, wet weather
It has been raining for hours, it is the season of lovely weather for ducks after all.