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

1.
sama sekali, bagaimanapun juga
even with the greatest effort; used to emphasize that someone cannot do something
:
•
I can't remember his name for the life of me.
Aku tidak bisa mengingat namanya sama sekali.
•
She couldn't understand why he did it for the life of her.
Dia tidak bisa mengerti mengapa dia melakukannya sama sekali.