Meaning of the word "for the life of you" in English

What does "for the life of you" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

for the life of you

US /fɔr ðə laɪf əv ju/
UK /fɔː ðə laɪf əv ju/
"for the life of you" picture

Idiom

even with the greatest effort; used to emphasize that someone cannot do something

Example:
I can't remember his name for the life of me.
She couldn't understand why he did it for the life of her.